Add CAP_OR to the list of ORM driver capabilties

Allows client to segment OR queries when the underlying driver does
not support them.
Don't validate email addresses using the network on GAE

Unfortunately, there seems to be no way to perform DNS queries in
GAE, so for now we'll ignore the useNetwork parameter.
Avoid performing an OR query when the backend does not support it
Remove debug print
Add -oauth option to gae-deploy command

Also, remove the app binary before uploading. Otherwise the full
binary gets uploaded.