Add auth scopes

[ocramz]

For completeness:

val ServiceControlScope = Scope("https://www.googleapis.com/auth/servicecontrol")
val LoggingScope = Scope("https://www.googleapis.com/auth/logging.write")
val ComputeScope = Scope("https://www.googleapis.com/auth/compute")
val MonitoringScope = Scope("https://www.googleapis.com/auth/monitoring")
val CloudKmsScope = Scope("https://www.googleapis.com/auth/cloudkms")
val ServiceMgmtReadOnlyScope = Scope("https://www.googleapis.com/auth/service.management.readonly")
val TraceAppendScope = Scope("https://www.googleapis.com/auth/trace.append")