Move inline properties to variables.less

moved buttons.less, carousel.less & close.less in this commit
moving code and dropdowns to variables.less
moving forms, labels and list-group to variables.less
Fixed breadcrumbs link
Update Normalize.css URL to new Github.io domain
Merge pull request #8536 from ggam/patch-1

Fixed breadcrumbs link in customize
Merge pull request #8538 from brentmulligan/3.0.0-wip

Update Normalize.css URL to new Github.io domain
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 remote-tracking branch 'upstream/3.0.0-wip' into 3.0.0-wip
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