fix(jqLite): support space-seperated events in off

Closes #3256
style($sce): remove unreachable return statement
chore(travis): print grunt exit code for debugging
fix(re-bootstrap): Threw an error when attempting to bootstrap and already-bootstrapped element.

Nothing would prevent a user from accidentally calling angular.bootstrap on an element that had already been bootstrapped. If this was done, odd behavior could manifest in an application, causing different scopes to update the same DOM, and causing debugger confusion.