Using cdnjs for test runner, adding es5shim and rangy.
Per @aron https://github.com/openannotation/annotator/issues/408
Merge branch 'master' into grunt-test
Adding IE shim for Sinon.
For https://github.com/openannotation/annotator/issues/414
Adding comment on plugin instantiation for tests.
Per @aron https://github.com/openannotation/annotator/pull/412#issuecomment-52942302
Merge branch 'master' into grunt-test