This allow to specify a protocol for an actor as below:
class Protocol:
"Class containing abstact methods to be implemented"
class MyActor(Actor[MyProtocol]):
"Class containing methods implementations"
Move tobiko.common._proxy module to tobilo.actors
Mova tobiko.actor._actor module to tobiko.actors
Change-Id: Ic9a7440a870c48db9449ccec907599eaaab88cfd