Fix failing tests

 - Fix strong-remoting tests - copy test-server files from strong-remoting-android to
test-server/remoting.
 - test-server: fix setup of push-notification (there was a breaking change)
 - test-server: rework auth setup to 2.0 style
 - UserRepository: fix `logout` to use `POST` method

Close #44

/to @raymondfeng please review