help-block margin-top should also apply after a span.uneditable-input

Update Makefile's UglifyJS commands

Fixed both instances of uglifyjs usage.

Fixes #5594: Vertical button groups show use max-width, not width, and be scoped to immediate children buttons only

* IE8 refused a negative z-index to place the previous :after behind the .arrow, so I had to flip the styles.
* .arrow is the gray border/background, .arrow:after is now the white inner arrow
* Added a hex IE8 fallback to ensure the arrow shows for <IE9 as rgba() isn't supported
* Simplified some of the CSS for the popover carets

* Remove back to top link (ya'll are lazy :P)
* Center text
* Decrease vertical padding

Fix typo in reset.less

Previously, we were using a generic label selector, but as this was changed in the main forms awhile back, we need to change it here.