Dropdown in panel header does not inherit its colors

Fix for issue #10627
Removed the unnecessary override and the !important from .wrap

In the sticky footer example there were some weird stuff..
Same fix for the navbar example of sticky footer
remove comma separating the color and the color-stop in -webkit-linear-gradient in the #gradient .vertical mixin.
Fixes issue #11122 -- navbar-fixed-bottom border

Enable border-top in .navbar-fixed-bottom
(Not HTML) tag way is much better
Merge pull request #11166 from ZDroid/tag_way

(Not HTML) tag way is much better
Continue tag way implementation
Merge pull request #11183 from ZDroid/patch-1

Continue tag way implementation
Fixes #10903 and #10457: IE8-9 don't support events on elements without background-color, so we have to hack it
run grunt dist
Merge branch 'master' of github.com:twbs/bootstrap
Merge branch 'master' into carousel_indicators_ie

Conflicts:
	dist/css/bootstrap.min.css
mo grunt
Merge branch 'master' into carousel_indicators_ie
fixes #11151: remove unused h5bp class from print CSS
Merge branch 'master' into carousel_indicators_ie

Conflicts:
	dist/css/bootstrap.min.css
Merge pull request #11186 from twbs/carousel_indicators_ie

Carousel indicators for IE8-9
fixes #11126: remove box-shadow from open dropdown toggle with .btn-link
Fixes #10522: Enable use of form validation class on .radio, .checkbox, .radio-inline, and .checkbox-inline