Add message authentication basics.
add support for message auth in transports, rmi, and policy.
Merge branch 'config-1.0' into message-auth-1.0

Conflicts:
	src/gofer/agent/rmi.py
refined authentication; pass uuid to is_valid.
Merge branch 'gofer-1.0' into message-auth-1.0

Conflicts:
	src/gofer/agent/rmi.py
	src/gofer/rmi/consumer.py
number of threads must be int.
send 'rejected' status report when message validation failed.
fix request.routing.
raise ValidationFailed when authenticator raises an exception.
Merge pull request #11 from jortel/message-auth-1.0

Message auth 1.0