Summary:
Basic implementation of the proposal in #15271

Note that this should not affect facebook internally since they are not using OSS releases.

Points to consider:
- How strict should the version match be, right now I just match exact versions.
- Wasn't able to use haste for ReactNativeVersion because I was getting duplicate module provider caused by the template file in scripts/versiontemplates. I tried adding the scripts folder to modulePathIgnorePatterns in package.json but that didn't help.
- Redscreen vs. warning, I think warning is useless because if the app crashes you won't have time to see the warning.
- Should the check and native modules be __DEV__ only?

**Test plan**
Tested that it works when version match and that it redscreens when versions don't before getting other errors on Android and iOS.
Closes https://github.com/facebook/react-native/pull/15518

Differential Revision: D5813551

Pulled By: hramos

fbshipit-source-id: 901757e25724b0f22bf39de172b56309d0dd5a95

Summary:
React Native v0.48.0 shipped `WebSocketModule` support with `BlobModule` as dependency. But `BlobModule` is not mocked in jest which will cause render tests failed.

Reference implantation: [BlobModule.java](https://github.com/facebook/react-native/blob/ed903099b42259958d8a6eb3af1a6460c1bc8b2c/ReactAndroid/src/main/java/com/facebook/react/modules/blob/BlobModule.java)

Related PR: #11417
Related issue: #15810

Passed CI tests.
Need render a component in jest with WebSocketModule as dependency.
Closes https://github.com/facebook/react-native/pull/15843

Differential Revision: D5783263

Pulled By: shergin

fbshipit-source-id: 2386692f4a644796da2fd66b3135da9f5911663e

Summary:
This avoids a crash when we try to load a PHAsset with nil image url. Specifically, the following condition evaluates to true when `imageURL` is nil:

```objc
if ([imageURL.scheme caseInsensitiveCompare:@"assets-library"] == NSOrderedSame) {
    assetID = [imageURL absoluteString];
    results = [PHAsset fetchAssetsWithALAssetURLs:@[imageURL] options:nil];
}
```

The crash will be "attempt to insert nil object from objects[0]" when we build the `@[imageURL]` array literal.

We've seen this emerge as a very common crash among Expo users, so I wanted to at least provide a clear error message instead of terminating the app.

Load an image from the photo library with a nil request url.
Closes https://github.com/facebook/react-native/pull/15952

Differential Revision: D5835219

Pulled By: ericnakagawa

fbshipit-source-id: 7be00a15e674a0905cf5c27c526ce9085d1b308f

Summary:
This PR refactors the symlink finding logic in local-cli in order to support nested symlinked modules as well as symlinked scoped NPM modules.

Run tests, or try project with `npm link`'ed or `yarn link`'ed dependencies.
Closes https://github.com/facebook/react-native/pull/15776

Reviewed By: cpojer

Differential Revision: D5823008

Pulled By: jeanlauliac

fbshipit-source-id: f2daeceef37bed2f8a136a0a5918730f9832884c

Summary:
Apps targeting Android 8.0 (API level 26) cannot use `TYPE_SYSTEM_OVERLAY ` and `TYPE_SYSTEM_OVERLAY `. Targeting 26 will cause the app to crash when in `DEV_MODE`.

https://developer.android.com/about/versions/oreo/android-8.0-changes.html#cwt

This PR replaces uses of these overlay flags with the new `TYPE_APPLICATION_OVERLAY` when running on a device with Android 8.0 or later.

When using `TYPE_APPLICATION_OVERLAY` it still requires the `SYSTEM_ALERT_WINDOW` permission, just like previous android versions.
https://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#TYPE_APPLICATION_OVERLAY

https://github.com/AndrewJack/react-native-android-oreo tested here
Closes https://github.com/facebook/react-native/pull/15601

Reviewed By: achen1

Differential Revision: D5801619

Pulled By: shergin

fbshipit-source-id: 27d1b9bb64018e7f12f9c3d3d222f1fda468b124

Reviewed By: fromcelticpark

Differential Revision: D5536063

fbshipit-source-id: b0f19bebea839c7da84890c338ad4d38293bc99c

Summary:
Workaround for #15726.
Closes https://github.com/facebook/react-native/pull/15817

Differential Revision: D5767831

Pulled By: hramos

fbshipit-source-id: f0324ed4052007648ac23f9015069a97f005d19b

Summary:
Commenting these out until we can stop breaking the OSS builds.
Closes https://github.com/facebook/react-native/pull/15859

Differential Revision: D5789816

Pulled By: hramos

fbshipit-source-id: f3b2ecd0cbcb4dbe5e35697a925b2a8bd8397afe

Summary:
We assign the value to an NSInteger so we should convert the NSString to an NSInteger instead of an int.

Build the app in Xcode and run it.
Closes https://github.com/facebook/react-native/pull/15806

Differential Revision: D5767118

Pulled By: shergin

fbshipit-source-id: b310511f13f5f4026d595a219d69811801d313c2

Summary:
Fixes "[NSTaggedPointerString unsignedIntValue]: unrecognized selector" error
Closes https://github.com/facebook/react-native/pull/15755

Differential Revision: D5763628

Pulled By: shergin

fbshipit-source-id: 6e1d1b1ae6bc63e07112b9dddcdf8e6f812a7f51

Summary:
fix the regression I mentioned in https://github.com/facebook/react-native/pull/15162#issuecomment-319696706

as no one is working on this, I take the step, although I know nothing about Objective C

I find the key point is that the keys in `NSDictionary` are not ordered as presented, it's a hash table, so no grantee on keys order, so I create a new array to do that, then it will check `ultralight` before `light` and `semibold` before `bold`
Closes https://github.com/facebook/react-native/pull/15825

Differential Revision: D5782142

Pulled By: shergin

fbshipit-source-id: 5346b0cb263e535c0b445e7a2912c452573248a5

Summary:
This code related to velocity would cause some scroll events to be skipped and caused some jitter for sticky headers. Not sure if there is a better fix but removing this does fix missing events and the velocity calculation still seems to be working.

**Test plan**
Tested that sticky headers now work properly on Android, tested that velocity calculation still seem to work.
Closes https://github.com/facebook/react-native/pull/15761

Differential Revision: D5760820

Pulled By: sahrens

fbshipit-source-id: 562b5f606bdc5452ca3d85efb5e0e3e7db224891

Reviewed By: javache

Differential Revision: D5727367

fbshipit-source-id: ef6c03e57ee0c40da9411c77f0e8a733945afa07

Reviewed By: cpojer

Differential Revision: D5754623

fbshipit-source-id: b70bfa105e6752db5350b82433bd64e1ca45f33b

Reviewed By: nlutsenko

Differential Revision: D5739990

fbshipit-source-id: a1b862faab1dbcdb3bcc11f1bf662241cf7252e5

Summary:
The icon size in the test/example cannot be rounded correctly as 3x image, causing redbox like:

```
-[RNTesterSnapshotTests testTabBarExample] : failed: caught "NSInternalInconsistencyException", "RedBox error: Error setting property 'icon' of RCTTabBarItem with tag #14: Image source flux@3x.png size {33, 33} does not match loaded image size {33.333333333333336, 33.333333333333336}."
```
This simply resizes them from 100x100 to 99x99

Reviewed By: javache

Differential Revision: D5747345

fbshipit-source-id: 084b4b028436b18dab324fef1fb0a4365072be75

Reviewed By: achen1

Differential Revision: D5661567

fbshipit-source-id: 005323afbbb33ec5e36cbce7f395edc573dcc2ff

Differential Revision: D5724764

fbshipit-source-id: a2f9c6917aea1d47854a1fd38a51b45c0b624ec2

Summary:
Thanks for submitting a PR! Please read these instructions carefully:

- [x] Explain the **motivation** for making this change.
- [ ] Provide a **test plan** demonstrating that the code is solid.
- [ ] Match the **code formatting** of the rest of the codebase.
- [ ] Target the `master` branch, NOT a "stable" branch.

The existing documentation on this topic doesn't provide enough of detail on where to start a headlessJS task.

Just docs change

This PR extends HeadlessJS documentation to show an example on how to start HeadlessJsTaskService. Sample code in example reacts to connectivity change using custom broadcast receiver logic that bundles additional information and starts the aforementioned service.
Closes https://github.com/facebook/react-native/pull/13957

Differential Revision: D5746809

Pulled By: hramos

fbshipit-source-id: 3eeea7d4a71382acf4b6f7ad1b99d20e2745c558

Reviewed By: cpojer

Differential Revision: D5745702

fbshipit-source-id: 6dc88811525e1595f58b23b7d0ebd5cc9f309785

Summary:
I've made some contributions in the repo/other libraries and replied to a lot of issues/StackOverflow questions and want to help more  ️
Closes https://github.com/facebook/react-native/pull/15723

Differential Revision: D5746712

Pulled By: hramos

fbshipit-source-id: eac609b3cb1703b5c06a6368de8a0ea608d7e918

Summary:
<!--
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Help us understand your motivation by explaining why you decided to make this change.

You can learn more about contributing to React Native here: http://facebook.github.io/react-native/docs/contributing.html

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I am a web developer, who recently started coding for mobile apps using react-native. I was trying to use the `inlineImageLeft` props of TextInput, but I found that it's docs weren't sufficient. So a PR for it.

No code change. Updated the docs under website folder. Screenshot for the change below.

![screen shot 2017-08-30 at 4 39 32 pm](https://user-images.githubusercontent.com/6011865/29869747-e73d9dde-8da1-11e7-912a-16e3115b8296.png)
Closes https://github.com/facebook/react-native/pull/15708

Differential Revision: D5738795

Pulled By: hramos

fbshipit-source-id: b8b6cbac5c50abd4d8a6ef8089dc9d92bc0b7f6f

Reviewed By: javache

Differential Revision: D5736692

fbshipit-source-id: e90dc38fa203ae65ac839f37940e96f23b35c330

Reviewed By: alexeylang

Differential Revision: D5694813

fbshipit-source-id: 2e2517e60a7547e261a7c15a3a9138dbb3cb9783

Reviewed By: AaaChiuuu

Differential Revision: D5694652

fbshipit-source-id: c7bfe4f222fd7b29baaec4102abe4f920ceaccc6

Summary:
Wanted a "message-only" alert on iOS that doesn't lead to the message being large & bolded via the title field (current state).

Before:

![screen shot 2017-08-28 at 9 22 04 pm](https://user-images.githubusercontent.com/1047502/29801514-fc3629d2-8c3d-11e7-86d5-f0a866301814.png)

After:

![screen shot 2017-08-28 at 9 26 56 pm](https://user-images.githubusercontent.com/1047502/29801521-071aa1ca-8c3e-11e7-9bd0-0a4682d81979.png)

It also aligns iOS with Android's current behaviour.

The above screenhots were generated from the `RNTester` example added herein.

Allowed for passing an empty string through to `UIAlertController.alertControllerWithTitle` so that the message could be rendered in its expected place on iOS (not as the title).

* Ran RNTester & compared example alerts before & after (below default with titles, for example)
* Ran end-to-end manual test suite (it's the only one I could get through without unrelated failures)

Before

![screen shot 2017-08-28 at 9 21 53 pm](https://user-images.githubusercontent.com/1047502/29801775-6e249ff0-8c3f-11e7-888b-2c4d5177a7d7.png)

After

![screen shot 2017-08-28 at 9 26 40 pm](https://user-images.githubusercontent.com/1047502/29801781-7270c4a8-8c3f-11e7-8b9b-59b2649646f2.png)
Closes https://github.com/facebook/react-native/pull/15685

Differential Revision: D5729420

Pulled By: hramos

fbshipit-source-id: 4866b0b24473ae35e9ebae09f2cee13a49d7717e

Summary:
Third meeting notes.
Closes https://github.com/facebook/react-native/pull/15674

Differential Revision: D5727572

Pulled By: hramos

fbshipit-source-id: 595cad320a7e6e4145533321736646cd230ef3e0

Summary:
<!--
Thank you for sending the PR! We appreciate you spending the time to work on these changes.

Help us understand your motivation by explaining why you decided to make this change.

You can learn more about contributing to React Native here: http://facebook.github.io/react-native/docs/contributing.html

Happy contributing!

-->
Changing all pages in doc to have title " - React Native", which will make the results easier to distinguish like suggested in issue #15659.

I'm not shure how to write a test to this but if you open any page in doc you can see the page title has changed when the title is passed to Site component.
Closes https://github.com/facebook/react-native/pull/15714

Differential Revision: D5739971

Pulled By: TheSavior

fbshipit-source-id: ba9b5ea83fe5c502653972262eb993a24941a62e

Reviewed By: AaaChiuuu

Differential Revision: D5737684

fbshipit-source-id: dc9312f595da23390cda14d5092c92d1e0319b83

Reviewed By: achen1

Differential Revision: D5724107

fbshipit-source-id: 26548c0bc937b725d0cbe3c139ace09006f4fddb

Reviewed By: javache

Differential Revision: D5724406

fbshipit-source-id: 24974601d161fd23805d8e925b2b20a1cf11850d