Initial prototype support for cassandra backend via datastax java-driver/cql3
modified code
Pull back into line with hibernate-ogm repo
Added schema definer
Merge branch 'cass-jhalliday' of github.com:johnWorrell/hibernate-ogm into cass-jhalliday

Conflicts:
	cassandra/src/main/java/org/hibernate/ogm/datastore/cassandra/CassandraDialect.java
	cassandra/src/main/java/org/hibernate/ogm/datastore/cassandra/dialect/impl/CassandraSequenceGenerator.java
	cassandra/src/main/java/org/hibernate/ogm/datastore/cassandra/impl/CassandraDatastoreProvider.java
	cassandra/src/main/java/org/hibernate/ogm/datastore/cassandra/impl/CassandraIntegrator.java
	cassandra/src/test/java/org/hibernate/ogm/datastore/cassandra/utils/CassandraTestHelper.java
Mangled merge - at least now builds again