Fixes 14116: Use <button> elements over empty anchors

BS3 commits: 7ec6c9fd133396f4576d0a030b26931715fb8af2
grunt

BS3 commits: 717a50ce19ed2f76e6b9eaf2f16be746cdfa23c0
Fixes 14095: Add basic styling for captions, which we've for some reason been missing all this time.

BS3 commits: fe0ef388982399d8925ec7aa8a70c4b4df3aa7e6
code guide, fixes 14126

BS3 commits: 5850f637ab8247ab36d7153d1e7025feca0bb567
New Android select example

BS3 commits: 2000e854ed92de8986a990fd1ae20c62b84b05be
Fixes 14132: add .alert-dismissible to docs examples

BS3 commits: d9a38cd99f3346a7565bf31cb9143755158c8219
Fixes 14133

BS3 commits: bb1286a0ab073bce1d18f704d7ac0545ea76c6ef
Redundant thanks to bb1286a

BS3 commits: cd7250d6a8f2144c7cfa2103713b4a19ddb2ea90
Fix inaccessible buttons.

BS3 commits: ed8228e1cbf73c1919c291054f4ea1309923cdae
missed changes
Fixes 14107: Lighten placeholder text. grunt. Fixes 14095: Add basic styling for captions, which we've for some reason been missing all this time. grunt

BS3 commits: bd292ca3b89da982abf34473318c77ace3417fb5,
2962f845a5f07dea5060a7204a527eff1522d48d,
fe0ef388982399d8925ec7aa8a70c4b4df3aa7e6,
7a8d9dbdbfd150759847bbb8b230211b8bd1e5ea
grunt. grunt. grunt

BS3 commits: 717a50ce19ed2f76e6b9eaf2f16be746cdfa23c0,
2962f845a5f07dea5060a7204a527eff1522d48d,
7a8d9dbdbfd150759847bbb8b230211b8bd1e5ea
Fixes 14107: Lighten placeholder text. grunt. Fixes 14095: Add basic styling for captions, which we've for some reason been missing all this time. Fixes 13974, 14123: Remove translate3d repaint performance enhancement for text rendering and position wonkiness. Fixes 14074: Make open dropdown nav links in navbar use gradients

BS3 commits: bd292ca3b89da982abf34473318c77ace3417fb5,
2962f845a5f07dea5060a7204a527eff1522d48d,
fe0ef388982399d8925ec7aa8a70c4b4df3aa7e6,
3e8cddf8671db110c1d46c46c13065f6b9a67ad1,
8c586a8e3ef3ce31cb18e064a0e78332a785d7a2