Fixes #7611: fix optgroup formatting for Firefox
Fixes #7474: Use `@input-height-base` in `.navbar-vertical-align()` for `.navbar-form`
Refactor readme to include directions on running jekyll locally
Update contributing file

* Remove notes on repo section
* Update hirearchy of coding standards sections
Back to getbootstrap.dev for jekyll
Fixed broken Customizer link for docs
Fixes #7943: typo in makefile
Merge pull request #7945 from AJ-Acevedo/fix

Fixed broken Customizer link for docs
upgrade jshint to 2.1.2 for anton <3
remove jszip files
remove make gh-pages command
remove 3rd arg from $.each call
Bring the customizer up to speed

I reworked the customizer to match the new docs layout and include all
newly added variables, etc.
Would be glad to keep an eye on Customize and update it as v3 changes.
Help blocks in my new version need some more work, too, so this is just
a basis.
Merge branch '3.0.0-wip' of https://github.com/juthilo/bootstrap-wip into 3.0.0-wip
delete customize layout since it's no longer in use
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
fixes #6898: typo in modal test
fix up customizer js and classes; turn buttons into real buttons
rejigger the customizer layout
Remove commented out code and properly nest CSS again for .collapse