Merge pull request #10209 from clbn/master

Fixes #10207: alert-dismissable example requires contextual class
Merge pull request #10208 from javiereguiluz/patch-2

[doc] tweaked the appearance of the last item of the file listings
Merge pull request #10215 from XhmikosR/master

Various
Fixes #9991: Better docs for tabbable tabs and fade classes

* Adds full code snippets
* Adds snippet for `.fade`
* Adds callout for `.in` requirement on first fade-able tab
Merge branch 'master' of github.com:twbs/bootstrap
Fixes #10088: Simpler nested headings section in accessibility docs

* Headings, not headers
* Simplifies content compared to #10088 which adds quite a lot
* Uses proper heading elements (`h1` - `h6`) and not `header`
* Collects links at bottom instead of mid-paragraph
Merge pull request #10131 from andyen/master

correct enable selector for button usage in docs
Fixes #10082: document `.navbar-form`

* Adds new section to navbar docs with example
* Updates example classes for all collapsing navbars so their numbers
increment as you scroll
fixes #9901
Fixes #9928 and #9932: carousel example in IE10

* Use absolute positioning instead to remove navbar from flow of
document
* No more negative margin fu
* Flip around padding between container and navbar for proper display
in xs and sm viewports
a few wording tweaks

- Changed some existential constructions (yes, they're really called
existential http://en.wikipedia.org/wiki/Existential_clause). These
aren't innately evil, but rewordings of existential clauses often sound
more direct.
- Changed a "which" to a "that."
Merge pull request #10222 from jodytate/upstream

a few wording tweaks
Fixes #10154: add .small
fix styling of alert-dismissable example
components.html: fix grammar
Make custom max-width on row conform to Boostrap convention

Bootstrap break point for tablet portrait 768 keeps the row intact, so it's not appropriate to have off-canvas elements at that width. Custom off-canvas.css should be breakpoint 767px
use direct-child selector more in table styles to better support nested tables; fixes #10231
Parameterize @breadcrumb-separator
Update index.html

Updated text in the jumbotron container to reflect the Bootstrap 3 change from hero unit to jumbotron. (Wasn't sure if it should be 'a Jumbotron' or just 'Jumbotron' though...
Base the navbar default brand hover color on default brand color

IMHO this default is better