Added retina image support mixin
typo
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
comment
Fixes #7150: colorize links in alerts
fixes #7140: hide navbar toggle in print
Merge branch '3.0.0-wip' of https://github.com/dannykeane/bootstrap into dannykeane-3.0.0-wip
convert to preboot's retina mixin