Apply @color argument to striped gradient

The @color argument is currently not being used for the striped gradient.
Remove progress bar striped @color parameters; use default transparent white.

* If the @color parameter is not removed, the stripes are the same color as the element background color. In this case, the stripes do not appear.
code.less: also set default monospace font for `<kbd>` and `<samp>`
Fixing carousel control positioning

The left control should be positioned from the left, while the right
control should be positioning from the right. Positioning both from the
left results in the right carousel control being incorrectly positioned
(most noticeable with a larger than normal font size).
Add missing methods (rotateX/Y, perspective(-origin) and transform-origin)

Added missing mixins:
rotateX
rotateY
perspective
perspective-origin
transform-origin
Deprecate container-{device} vars for container-{size} classes; updates customizer and grid to do the same
Fixes #10154: add .small
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
Prevent X-scroll on small screens

html overflow-x must be hidden to prevent accidental x-scroll on small screens. This is more apparent with touch screens, where the user often gestures diagonally instead of a true vertical gesture.
fix #10252 by restricting Android Firefox reset to only .form-control & .btn
Add a change to the progress bar. 

In v3 the inner progress bar should have .progress-bar not .bar
More concise 'fastest way' statement, and consistency with the text of the Download button
more refactoring of the 'Getting started' section towards more succinct and active wording.
Moved "Major class changes" section; Added progress-bar-*
Getting started docs: tweaks to the _Basic template_ section
Merge pull request #10265 from twbs/fix-10252

fix #10252 by restricting Android Firefox reset to only .form-control & .btn