Add the masthead examples

Fixes #118
fix comments
fix class name
Add the Toolbar examples

Fixes #119
adjust the layout for the examples
Double-clicking on a .btn-ized radio button shouldn't de-select it

BS3 commits: e7d6af003e6af02c26cc8864da72dc807f8f97a1
add release checklist to CONTRIBUTING file

BS3 commits: a639c6e1cf2eb0457be84290f7848c3eb9eaad27
give the nav examples more room
add warning about WebKit bug to the justified nav example itself

BS3 commits: c1c2a8e18867bfa1644928428c693b367a5617a1
Merge branch 'master' into list-group-style