Update affix properly on scrollspy speedy scroll to top of page #11310

Fix scrollspy.js so as affix is updated properly when user scrolls fast
to top of page.

A fix for issue #11310.
Allow listbox AIRA role on dropdown component.
Merge two fs variable declarations into one

One is enough.
Rearrange repository contents because muahahahahahaha
Streamline copy process by not bringing over full files into docs/dist/, only take minified ones
no more page.base_url
fixes #11288 - Vertical scroll position of modal saves between openings
Merge branch 'master' of github.com:twbs/bootstrap
Merge branch 'scrollspy-speedy-scroll-top' of git://github.com/ziogaschr/bootstrap into ziogaschr-scrollspy-speedy-scroll-top

Conflicts:
	dist/js/bootstrap.min.js
fixes #11373 - adds related target to dropdown events
fixes #11379 - Fix carousel this.sliding not getting reset if $next.hasClass('active')
Merge branch 'dropdown-aria-roles' of git://github.com/plumlee/bootstrap into plumlee-dropdown-aria-roles

Conflicts:
	js/dropdown.js
Merge pull request #12036 from ZDroid/grunt-fs-minify

Merge two fs variable declarations into one
Merge branch 'master' of github.com:twbs/bootstrap
add note about ios dropdown compat
mv sauce_browsers.yml out of the project root
Merge pull request #12041 from twbs/mv-sauce-into-infra

mv sauce_browsers.yml out of the project root
fix capitalization of iOS
default to latest Firefox version on OS X
Sauce now supports latest Firefox on OS X Mavericks