Make the number of Cassandra replicas a setting.
Update documentation to reflect the new setting.
Changing the compaction strategy. Or trying to anyway.
Cassandra wants a string but really it's an int so keep
everyone happy.
Changing the default replicas to 1 to better match the most common
deployment scenario (perfSonar).
Merge branch 'configure_replication' of https://github.com/esnet/esmond into configure_replication