Remove commented out CSS
Remove more commented out CSS from forms
Update forms example to show sequential form inputs for later testing
Update docs on responsive images and elaborate on IE8 support using Respond.js
Update file input to remove height and line-height

This particular form control is wildly inaccurate across browsers, so
we're removing the `height` and `line-height`, but adding `display:
block` so it renders similarly to our other inputs.
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip

Conflicts:
	dist/css/bootstrap.min.css