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
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
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 #10324: Add opt-in note to tooltip docs

* Re-added a note (now callout) about need to opt in to tooltip docs
* Converted same note in popover section to callout
Refactoring the paragraph describing the 'Examples' section.
Getting Started page: Simplified and focused the text of the 'Disabling responsiveness' section.
update box-sizing third party support section to include mention of google CSE and expand to include CSS and Less options
Merge branch 'master' of github.com:twbs/bootstrap
Merge pull request #10382 from StevenBlack/GSEdits5

'Disabling responsiveness' section of docs: simplification and focus
fixes #10372: two download buttons on homepage; also fixes broke button styles
mo betta docs on box-sizing to build on e521ee83094f5a70978cc9d879f400c3ac95369c
Merge branch 'master' of github.com:twbs/bootstrap
remove unused .panel-collapse ruleset
Merge pull request #10375 from StevenBlack/GSEdits4

Refactoring the paragraph describing the 'Examples' section.
fixes #10396: mention table class change in migration docs
Merge branch 'master' of github.com:twbs/bootstrap