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
refactored the slot imlementation code
ccode refactored
MB-745
Merge pull request #45 from sajinidesilva/slots_Imp

 Refactored the slot imlementation code
MB-745-v2
Merge pull request #46 from sperera/master

MB-745
cluster coordination selection implementation started
Merge pull request #47 from sajinidesilva/slots_Imp

cluster coordination selection implementation started
Merge pull request #1 from wso2-dev/master

Get latest 18-09-2014