code refactor
#491
Merge branch 'trunk' of https://github.com/impetus-opensource/Kundera into trunk

Conflicts:
	src/jpa-engine/core/src/main/java/com/impetus/kundera/utils/KunderaCoreUtils.java
	src/kundera-cassandra/cassandra-core/src/main/java/com/impetus/client/cassandra/datahandler/CassandraDataHandlerBase.java
	src/kundera-mongo/src/main/java/com/impetus/client/mongodb/query/MongoDBQuery.java