Update dependencies.

BS3 commits: 898328655f1978656fa2eba49bb0d2b43557e712
Remove broken link to Customizing Bootstrap

BS3 commits: 7339759fd6e11473a633f55f53a0b4ced6a7fa7d
fix typo in css - buttons

BS3 commits: e05a4f6ac5bde111eaf2614fbf37cb9f1aca5e9a
Fixes #13903: Restore side padding on .btn-block

BS3 commits: df7cfe86525252034cf85a365d09a4c2485116b4
grid class inconsistency

BS3 commits: 32bde78e1996a92e6b801e1f4a475d5ab48685f8
grid class inconsistency 2

BS3 commits: 25b06d927fa8fb056b3b146db263498a34401fb8