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
Use input type `password` for the password field in the CSS documentation.
getting-started.html: add <code> around mention of `placeholder`
Merge pull request #8573 from cvrebert/patch-2

getting-started.html: add <code> around mention of `placeholder`
Merge pull request #8572 from mohnish/patch-1

Use input type `password` for the password field in the CSS documentatio...
fixes #7970
shown.bs.modal fix
revert collapse change + add emulateTransitionEvent to catch dead css transitions
fixes #8134
add additional carousel test
update carousel js docs to reflect leading .glyphicon
  https://github.com/twitter/bootstrap/pull/6342 icons section
  mentions the change to using glyphicon base class
  this adds it to the docs
Update link to blog
Clear up license FAQs by using "Bootstrap" as noun instead of "Twitter open source software"
Merge pull request #8576 from sfaxon/3.0.0-wip

update carousel js docs to reflect leading .glyphicon
fixes #8232
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
Merge branch '3.0.0-wip' of github.com:twitter/bootstrap into 3.0.0-wip
make on prev commit