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.
remove useless display:inline-block
refactor button-groups.less
Fixed typo
Merge pull request #8544 from liuyl/removeuseless

remove useless display:inline-block
Merge pull request #8545 from liuyl/refactor-btngroups

refactor button-groups.less
Merge pull request #8546 from jeroenvisser101/patch-1

Fixed typo
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip

Conflicts:
	dist/css/bootstrap.min.css
Merge remote-tracking branch 'upstream/3.0.0-wip' into 3.0.0-sass

* upstream/3.0.0-wip:
  Fixed typo
  refactor button-groups.less
  remove useless display:inline-block
  Update file input to remove height and line-height
  Update docs on responsive images and elaborate on IE8 support using Respond.js
  Update forms example to show sequential form inputs for later testing
  Remove more commented out CSS from forms
  Remove commented out CSS