make it clearer than <input> buttons are slightly broken on Firefox

BS3 commit dfd10efd80ab56004cb34156b713e8ee7bffb075
correct docs typo on radio inputs

BS3 commit 09fff764eda8c5f10805ba7af6ae9aa93ecb79b4
Remove hack/workaround for jshint/grunt bug that's now fixed

BS3 commit 7ae32074a09fe09906f5d007c2891601e0438a5b
add code comments to grid example to clarify behavior

BS3 commit ddafa9a0bbc9cd89376a642ba9746ec668f6ce21
Restore mini button

BS3 commit 5716355cda6ad163342daf2fa021045d8afe9c36
move list group bg color to individual items for mo betta rendering

BS3 commit 09edfcf8c2525cb9ff397d48d8b6c9990ede30aa
update TODO
Refactor .input-* sizing a bit by not chaining to .form-control

BS3 commit 8b5e41d900987aa46f38ec990e1a1170fc69fc00
use appropriate variables for navbar-btn
add focus to button group active button behavior. Restore mini button. move list group bg color to individual items for mo betta rendering. Refactor .input-* sizing a bit by not chaining to .form-control

BS3 commits d9c9afa6d180001fd4ae1f8be9f330fdffc959ca,
5716355cda6ad163342daf2fa021045d8afe9c36,
09edfcf8c2525cb9ff397d48d8b6c9990ede30aa,
8b5e41d900987aa46f38ec990e1a1170fc69fc00