Added support for meta data on entries so that information like timestamp, TTL and visibility can be passed to the storage backend.
Added MetaData to IndexEntry as well
Merge branch 'titan05' of https://github.com/thinkaurelius/titan into titan05
Merge branch 'titan05' of https://github.com/thinkaurelius/titan into titan05
Implemented getting timestamps and ttl from Cassandra and added test case to verify its working using ImplicitKeys.
How to get the TTL from Cassandra embedded?