REALLY-64 Incomplete implementation of Replayer with modifications in gorilla system

Conflicts:
	really-core/src/main/scala/io/really/ReallyConfig.scala
	really-core/src/main/scala/io/really/gorilla/GorillaEventCenter.scala
	really-core/src/main/scala/io/really/gorilla/SubscriptionActor.scala
	really-core/src/main/scala/io/really/gorilla/SubscriptionManager.scala
	really-core/src/main/scala/io/really/gorilla/package.scala
	really-core/src/main/scala/io/really/package.scala
Really-64 Test cases
REALLY-64 Implemented the SubscribeRequestAggregator
Fixed the mechanism of new subscription
Removed the CID
Removed the pushChannel from the context
Fixed the Subscription messages JSON serializers
Introduced new Subscription Wrappers

Conflicts:
	really-core/src/main/scala/io/really/gorilla/SubscriptionManager.scala
	really-core/src/main/scala/io/really/model/persistent/RequestRouter.scala
	really-core/src/main/scala/io/really/package.scala
	really-core/src/test/scala/io/really/BaseActorSpec.scala
REALLY-64 Minor fix for the SubscriptionManager