fixes #4910: use @baseLineHeight * 1.5 for .lead font-size
fixes #4902: proper accordion html example
fixes #4922: use basefontsize for realz on .lead
fixes #4925: ensure docs examples don't use fixed font-size and line-height for .lead
fixes #4909: add color utility classes .text-warning, etc and document them
Merge pull request #4763 from Luis-TP/2.1.1-wip

Improve .box-shadow mixin by utilizing regex function to no longer require escaping
add comment to go with updated box-shadow mixin
fixes #4146: IE7-8 responsive image helper
fixes #4935: properly comment responsive image techniques and add CSS tests to support
fixes #4959: docs example
fixes #4957: use input border var for select element instead of #ddd
fixes #4885: correct use of skew in .skew() mixin for FF
fixes #4958: add version to minified js
improve comments in image styles
fixes #4968 manually: typo in scaffolding docs about offset classes
Merge pull request #4810 from mainerror/2.1.1-wip

Makefile misses a 'clean' directive
Merge pull request #4784 from rossj/2.1.1-wip

Fix Typeahead key navigation with Chrome + jQuery 1.8.0
regrettably remove the animated button for download on homepage to improve page performance in some browsers
Merge branch '2.1.1-wip' of github.com:twitter/bootstrap into 2.1.1-wip
last rebuild before 2.1.1 release