Squashed 'subtrees/bootstrap/' changes from d5290c6..6dbf588

6dbf588 fixes #9310: alerts aren't dismissable by default, now requires .alert-dismissable if you need a close button
aefed0a fixes #9317: document media queries
86fd07f update docs affix for large desktop given latest grid changes
efe62a7 rename and refactor a smidge to add medium grid mixins
f50aea3 Merge branch 'patch-12' of https://github.com/ggam/bootstrap into ggam-patch-12
a2b9988 Media query (grid and responsive utilities) overhaul
95affa3 simplify padding in list groups and margins on badges within
a0f3019 Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
ac74655 add another var
c52a350 Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
9e316be Merge pull request #9355 from kevinSuttle/aside
9d54732 Map 'role="complementary"' to proper aside element
2a8e576 Merge pull request #9353 from kevinSuttle/contentinfo
2ae8be3 Customizer field updates for variables
0819cfc addressing #9189 manually, part 7: thumbnails vars
1355c58 Map "contentinfo" role to HTML5 footer element
bf49000 Drop the font-weight on panel labels since heading elements already get it
fca5c81 Restore prior docs spacing
85ec6e7 Follow up commit: fix collapse clearing and navbar brand/nav spacing
f47a190 Merge pull request #9352 from kevinSuttle/aria-forms
ba8026e Refactor navbars to simplify things
a86f5d2 Give forms and search fields proper ARIA roles
63425cd Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
8bdffec rebuild + first bit of customizer urls
c2cfd31 addressing #9189 manually, part 6: add a navbar margin var, but avoid the navbar-nav var because that should really be customizable
e9650f5 addressing #9189 manually, part 5: don't bother with a .label font-weight var and let's just use bold because windows hates 500
a66cdb0 addressing #9189 manually, part 4: input group background var
83f1a75 addressing #9189 manually, part 3: forms
12b9058 Merge pull request #9351 from vsn4ik/quotes_in_nav_main
2866367 spacing
58b90da addressing #9189 manually, part 2: dropdown header and disabled link colors (and refactor commenting styles)
06da490 Move quotes in nav-main.html
8b76e0d addressing #9189 manually, part 1: code and pre vars
32f6cbf Merge pull request #9211 from zacwasielewski/responsive-visibility-utilities-as-less-mixins
83c236f Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
1ff1dfb fixes #9348 by ditching a comment
92c2ad9 fixes #8983
b8ed111 Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
89b3cb0 fixes #9318
9b07b99 Merge pull request #9286 from neilhem/3.0.0-wip
c49ecc5 refresh scrollspy after page 'loads'
39899e4 Merge pull request #9229 from ggam/patch-13
0561cfe fixes #8900: nuke empty space between panel heading and list group
31ab07b Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
bf2ab45 fix comment in tooltip
a88888a fix broken components page, also likely from @kevinsuttle's #9332
da75d0d Merge branch '3.0.0-wip' of github.com:twbs/bootstrap into 3.0.0-wip
65c0f84 fix borked js docs layout, likely from @kevinsuttle's latest PR
5c6b995 add event prefixes
6393a78 fixes #9279
b4081e6 Merge pull request #9347 from kevinSuttle/header
f38241d Ensure proper use and location of role="banner"
0b9efa9 fix indentation
a19ed6d Merge branch 'aria-nav' of https://github.com/kevinSuttle/bootstrap into kevinSuttle-aria-nav
6b6241f fixes #9241: enable collapsing for labels, in addition to badges, when empty
aa45413 Use nav for proper HTML5 ARIA role mapping
c07717c set img-circle class in percents
f69833f Removed Glyphicons mention from carousel.less
407c966 Make visibility utility classes responsive when used as LESS mixins
001e5d3 Added missing grid make-column mixins and fixed some inconsistencies

git-subtree-dir: subtrees/bootstrap
git-subtree-split: 6dbf588237529fc8909bf65caa103fd4fc224fbc
Merge commit '443a5264a7cceda3cb588747231b2941b675fc6c'