Parts of the "Pull requests" section are strangely worded.

This commit fixes that.

Hey look, I'm contributing to CONTRIBUTING.md!

This anchor must have been overlooked while updating the docs in a previous commit. Expected behavior: scroll the document to a linked section. Experienced behavior: nada.

This proposed file change renames the anchor text from `coding conventions` to `coding guidelines` and changes the anchor link from `#code-conventions` to `#code-guidelines`.

Simple grammar fix.

Except when speaking of the "recess" Node package, RECESS should be in all-caps.

Per http://blog.getbootstrap.com/2012/12/10/bootstrap-3-plans/ :
> * Drop the `*-wip` branch style of development.

its => belonging to it
it's => it is / it has

* Remove notes on repo section
* Update hirearchy of coding standards sections

Signed-off-by: Chris Aniszczyk <zx@twitter.com>