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
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 commit 5716355cda6ad163342daf2fa021045d8afe9c36,
09edfcf8c2525cb9ff397d48d8b6c9990ede30aa,
8b5e41d900987aa46f38ec990e1a1170fc69fc00
make it clearer than <input> buttons are slightly broken on Firefox. correct docs typo on radio inputs. add code comments to grid example to clarify behavior. Restore mini button

BS3 commits dfd10efd80ab56004cb34156b713e8ee7bffb075,
09fff764eda8c5f10805ba7af6ae9aa93ecb79b4,
ddafa9a0bbc9cd89376a642ba9746ec668f6ce21,
5716355cda6ad163342daf2fa021045d8afe9c36