Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip

composer.json

 {
     "name": "twbs/bootstrap"
-  , "description": "Sleek, intuitive, and powerful front-end framework for faster and easier web development."
+  , "description": "Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development."
   , "keywords": ["bootstrap", "css"]
   , "homepage": "http://getbootstrap.com"
   , "authors": [