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.
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
correct enable selector for button usage

following the given examples the correct selector to enable the buttons with javascript is ".btn-group".
rm inverted navbar search styles
Address #9873 and fix #9774

* Update styling of justified nav links to be more mobile friendly
(with all four rounded corners and some margin between items)
* Add note to docs to callout bogus WebKit rendering on component and
example
Fixes #10137: correct classes on thumbnails
Add margin to thumbnails for proper spacing

Hadn't thought about this until fixes #10137, but it makes sense I
think to have margin on the bottom of thumbnails for spacing when
stacking (or using different grid tiers).
Improve upon #9937: Link and put reset column stuff to action in the grid example
Fixes #10016 and updates that rather badly formatted callout
Add missing period on customize page.
Merge pull request #10204 from premist/master

Add missing period on customize page.
[doc] tweaked the appearance of the last item of the file listings
Fixes #10207: alert-dismissable example requires contextual class
per the docs - use <a> instead of <button>
add  role="button"
Compress PNG files losslessly.

Use zopfli with 1000 iterations, pngout /r with various blocksizes and deflopt.

assets/ico/apple-touch-icon-114-precomposed.png | Bin 2939 -> 2931 bytes
assets/ico/apple-touch-icon-144-precomposed.png | Bin 3614 -> 3549 bytes
assets/ico/apple-touch-icon-57-precomposed.png  | Bin 1577 -> 1573 bytes
assets/ico/favicon.png                          | Bin 889 -> 887 bytes

Total difference: -79 bytes.
Update Respond.js to v1.3.0.