Replace psiphon_config with stub and make it so test config will be excluded from source control; add DatastoreFilename to config
Explicit datastore initialization using filename in config
Fix "Notice" message handling: strip newline; there's no longer a timestamp prefix
New Android Library binary with recent changes and Go code fixes (https://github.com/golang/go/issues/9251 and https://github.com/golang/go/issues/9271)