Merge pull request #11966 from colllin/noconflict

Fix #11464 - JS noConflict() mode not working in 3.0.x
Merge pull request #13449 from sejr/master

Increase .lead font-weight for better readability on mobile
grunt dist
Merge pull request #13328 from thebigredgeek/master

Added bower reference to main less file
explain
grunt dist
Merge branch 'pr/13320'

Conflicts:
	dist/css/bootstrap-rtl.min.css
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/dist/css/bootstrap-rtl.min.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
document grid column wrapping behavior; fixes #13247
Merge pull request #13434 from twbs/fix-13247

document grid column wrapping behavior; fixes #13247
Not Less' fault per se
Remove sr-only from components/dropdown entirely

possibly less confusing option, as per discussion, is to always show the
dropdown trigger button (both live and in that code example)
add role="tooltip" to popovers; fixes #13481
make new Carousel tests compatible with noConflict mode
Merge pull request #13461 from patrickhlauke/docs-dropdown-sr-only

Remove sr-only from components/dropdowns example
bump grunt-css-flip to ~0.2.2
Merge pull request #13433 from watilde/fixed-navbar-radius-of-example-at-docs

Fixed navbar radius of example at docs
Improve accessibility of close buttons in modals & alerts

Adds textual caption to the close buttons. The "X" multiplication sign isn't very meaningful to screenreaders.

Credit: https://github.com/paypal/bootstrap-accessibility-plugin
Per:
    https://github.com/paypal/bootstrap-accessibility-plugin/blob/master/README.md#alert
    https://github.com/paypal/bootstrap-accessibility-plugin/blob/master/README.md#modal-dialog
document #13390
mark Android Firefox as officially supported
Wall of browser bugs: formatting tweaks