Updating javadoc, adding limit to GraphQuery and implementing this feature throughout the stack.
Updated transaction handling in BerkeleyJe
add storage.cassandra.thrift.{frame_size_mb, max_message_size_mb} options

Conflicts:

	titan-cassandra/src/main/java/com/thinkaurelius/titan/diskstorage/cassandra/thrift/CassandraThriftStoreManager.java
Provide default config files for TitanServer with cassandra.
Added sample berkelydb properties file for TitanServer.
Removed dangling 2