Merge pull request #40 from sperera/master

Changes suggested during hazelcast code review
removing global queues and addling slots instead- implemented basic functionalities
Thrift implementation started
AndesCOntext changes
Changed thrift server startup method. removed SSL configurations.
added util class
Merge pull request #42 from sajinidesilva/slots_Imp

Slots Implementation v1
Deprecated MessageStore implementations removed

	deleted:    modules/andes-core/broker/src/main/java/org/wso2/andes/messageStore/CassandraBasedMessageStoreImpl.java
	deleted:    modules/andes-core/broker/src/main/java/org/wso2/andes/messageStore/InMemoryMessageStore.java
Storage related classes moved to org.wso2.andes.store package
Merge pull request #43 from Asitha/storage-restructure

Storage restructure
MB-745