Restore prior docs spacing. Media query (grid and responsive utilities) overhaul. update docs affix for large desktop given latest grid changes

BS3 commits fca5c812c593b4c17121ae1d9c647c0387b51d8e,
a2b9988eb908e5b95fb253aac7fde0fbd61c375e,
86fd07f93c2d336aa4b74aebfaa37662f5240897
run build. simplify padding in list groups and margins on badges within. alerts aren't dismissable by default, now requires .alert-dismissable if you need a close button

BS3 commits 95affa32e6b756e54cc86b85a352aaa02e65bf9d,
6dbf588237529fc8909bf65caa103fd4fc224fbc
Give forms and search fields proper ARIA roles. Map 'role="complementary"' to proper HTML5 aside element. Media query (grid and responsive utilities) overhaul. alerts aren't dismissable by default, now requires .alert-dismissable if you need a close button

BS3 commits f47a1905e2847e528d982fbd454b2b8c8ce900bb,
9e316beba160e6351cfae2149364dc8b23b6d2f5,
a2b9988eb908e5b95fb253aac7fde0fbd61c375e,
6dbf588237529fc8909bf65caa103fd4fc224fbc
Give forms and search fields proper ARIA roles. Map 'role="complementary"' to proper HTML5 aside element. Media query (grid and responsive utilities) overhaul. rename and refactor a smidge to add medium grid mixins. document media queries

BS3 commits f47a1905e2847e528d982fbd454b2b8c8ce900bb,
9e316beba160e6351cfae2149364dc8b23b6d2f5,
a2b9988eb908e5b95fb253aac7fde0fbd61c375e,
efe62a7ef4b52229403253f8d7fd39d2d96ac875,
aefed0ada9791338be11dd5318b24f17f517d51a
rebuild + first bit of customizer urls. Give forms and search fields proper ARIA roles

BS3 commits 8bdffecf8f65a7bd4f27ad4d2afb922291a4e4ad,
f47a1905e2847e528d982fbd454b2b8c8ce900bb
Map 'role="complementary"' to proper HTML5 aside element. Media query (grid and responsive utilities) overhaul

BS3 commit 9e316beba160e6351cfae2149364dc8b23b6d2f5,
a2b9988eb908e5b95fb253aac7fde0fbd61c375e
Map "contentinfo" role to HTML5 footer element. Map 'role="complementary"' to proper HTML5 aside element

BS3 commits 2a8e5765b999ab785558966034a0d17d1b90830e,
9e316beba160e6351cfae2149364dc8b23b6d2f5
Map 'role="complementary"' to proper HTML5 aside element. Media query (grid and responsive utilities) overhaul

BS3 commits 9e316beba160e6351cfae2149364dc8b23b6d2f5,
a2b9988eb908e5b95fb253aac7fde0fbd61c375e
JS: missed files