Added retina image support mixin
Added Development > build: "make bootstrap" notes.
tweak icons alignment
Remove -webkit-backface-visibility on skew mixin

Ref #5319 - This rule is causing pixelated edges on iOS. Removing
it makes everything smooth across all OS's, browsers, and devices.
fix pluralization since "a" is in front
Set border-box globally instead
Fix minor grammatical problem

"check out" makes more sense here.
Update buttons.less to disable btn pointer events

Buttons that are disabled are still clickable and can still fire click events (such as hopping up to the top of the page if your anchor href points to "#"). Adding the pointer-events:none property will truly disable the button so situations like this don't happen. 
Added bower install to download/install options in getting started guide
Merge pull request #7227 from parndt/patch-1

Fix minor grammatical problem
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip

Conflicts:
	less/grid.less
Fixes #7281: make tables super specific for hovers and striping to avoid nesting issues
Merge branch '3.0.0-wip' of https://github.com/addyosmani/bootstrap into addyosmani-3.0.0-wip
modify copy
use the proper selector
fix example navbar brand
Rename license to license.md; point readme to it via link
herp derp, spelling booboo
underp license maybe
Additional heading font-size classes

This relates to changes in issue #7284