Merge branch 'master' of github.com:twbs/bootstrap
fixes #10246: Use correct variable for link hover color in Customizer
restore "only" wording in docs regarding Recess/less.js

It was there for good reason.
We're not gonna deal with lessphp or dotless bugs.
Merge pull request #10249 from coliff/patch-1

Update index.html (update text from hero unit to jumbotron)
Merge branch 'master' into tagliala-patch-1
finishes #10256 to add updated var to customizer; also fixes another old var
Merge branch 'master' of github.com:twbs/bootstrap
remove unused link from navs section
fixes #10277: Mention removal of navbar vertical dividers in migration docs
fixes #10282: Cross reference tabs and tabs plugin
Merge pull request #10298 from jhr007/patch-1

Note the change to the progress bar.
fixes alignment and nav list in offcanvas example
tweak #10298
Merge pull request #10336 from Shipow/master

Replace invalid US-ASCII character "\xE2")
tweak #10336 to double up on the hyphen-minuses to better approximate a long dash
fixes #10111: different colors for dropdown link hover and active states
fixes #10115: Default carousel controls and Glyphicon controls should behave the same on small devices and up
Merge branch 'deprecate_screen_containers'
reverse vars for backwards compatibility /cc @cvrebert
minor improvements to affix docs