Documents radio and checkbox validation states. Documents radio and checkbox validation states.

BS3 commits: d67fe0f5b9f2a5677a0c0dd5e4e8cc13ea57a91f
clarify the iOS virtual keyboard bug with respect to navbars

BS3 commits: afbe7114b4a362b6cae008328343d9e568c03457
merge in and resolve conflicts

BS3 commits: b4958aba69cd942271bba465d5cbc8ef4a1d0529
Fixes 13989: Don't extend the input sizes; manually chain the selectors

BS3 commits: 96b545c6b5ebf5f74b75a735359187bd9b80689d
grunt. grunt

BS3 commits: 4f8697cbbb86d0315bab9ac1fac5df403a2c57d7,
23dd323da1dbb84da8aa64451303009684ac8a65
Fixes 12738 again: use max-device-width instead of max-width for .navbar-collapse height in landscape devices

BS3 commits: 3537481c972c4b5ebb678e91cd477d1941f99424
merge in and resolve conflicts. Fixes 13989: Don't extend the input sizes; manually chain the selectors. Fixes 12738 again: use max-device-width instead of max-width for .navbar-collapse height in landscape devices

BS3 commits: b4958aba69cd942271bba465d5cbc8ef4a1d0529,
96b545c6b5ebf5f74b75a735359187bd9b80689d,
3537481c972c4b5ebb678e91cd477d1941f99424