Add .idea and *.iml to .gitignore
Move SerializerType from RedisConfig to SerializerFactory
Add Cassandra Persistence storage
Add unit and integration tests
Add log4j.xml for tests
Add com.github.pmerienne.trident.state.cassandra.CassandraClient.md as documentation to build a CassandraConfig object
Add test to CassandraConfig. Refactor Embedded Cassandra Server