Bootstrap 3RC1 - Different classes for input addons and glyphicons

In Bootstrap 3RC1:
* .input-append and .input-prepend became .input-group 
* .add-on became .input-group-addon
* icons were namespaced into glyphicon-* (and must be included separately in addition to Bootstrap itself)

This pull request attempts to handle each of those cases.

I did not test or look into the changes to Modals in Bootstrap 3, so this isn't a comprehensive fix for v3 (though I don't think there are any other issues besides the changes to modals).