Rename docs/LICENSE-DOCS to docs/LICENSE

It sounded weird.
Add tooltip `viewport` option, respect bounds of the viewport
refactoring: add & use .text-emphasis-variant() mixin
refactoring: add & use .bg-variant() mixin
add & use @modal-md Less var for uniformity
temporarily disable OS X Chrome Sauce test since it's being flaky

e.g.:
Tested http://127.0.0.1:3000/js/tests/index.html
Environment: OS X 10.9::chrome
>> Timeout, waited for more than 300000 milliseconds
enable IE10 for Sauce tests
Split box-sizing reset for faster rendering
Merge branch 'master' of github.com:twbs/bootstrap
Merge branch 'bo-tooltip-viewport' of https://github.com/benogle/bootstrap into benogle-bo-tooltip-viewport

Conflicts:
	docs/javascript.html
Merge pull request #12267 from twbs/ie-10

enable IE10 for Sauce tests
Revert "Add tooltip `viewport` option, respect bounds of the viewport"

This reverts commit edb221a20ceabebd427e27d0432e94a227717217.
Reverting due to broken JS unit tests.

Conflicts:
	docs/javascript.html
remove needless space character
Merge pull request #12271 from tlindig/modal_remove_needless_space

remove needless space character
Replace Normalize with Normalize.css
Merge pull request #12275 from ZDroid/ncss

Replace Normalize with Normalize.css
fix #12274
bump grunt-contrib-qunit to v0.4.0
Merge pull request #12276 from twbs/grunt-contrib-qunit

bump grunt-contrib-qunit to v0.4.0
add namespace `.bs` also to the event `dismiss.modal`