Remove decorator usage, fix tests
Remove decorator usage, fix tests

Duplicate warnings were not being logged, so tests would pass in
isolation but not as a part of the suite.
See: https://github.com/facebook/react/issues/4302

mmarcant/react-bootstrap,react-bootstrap/react-bootstrap,glenjamin/react-bootstrap,apkiernan/react-bootstrap,react-bootstrap/react-bootstrap,dozoisch/react-bootstrap,glenjamin/react-bootstrap,HPate-Riptide/react-bootstrap,react-bootstrap/react-bootstrap