Put FAKE_IMPLIED_TOKEN on RemoteStorage.Authorize; remove GDrive/Db code; fix tests
The FAKE_IMPLIED_TOKEN variable was not available from wireclient and sync;
making it a property of RemoteStorage.Authorize fixes that. Also, the
code in googledrive.js and dropbox.js was useless, as implied auth
is not supported there anyway. Finally, some unit tests were failing,
and this is fixed by defining RemoteStorage.Authorize.FAKE_IMPLIED_TOKEN
in their setup