Update README.rdoc
Merge pull request #13 from juanlizarazo/Allenardo

addresses issue #5 changes name key to user_id and addresses issue #9 up...
CQL for messages CF, update to users CF issue #14
Conflitcs resolved merge issue #14
Column family as second index for sorted messages Issue no #14
Merge pull request #16 from juanlizarazo/Juan

Column family as second index for sorted messages Issue no #14
Partial chat section migration to new cassandra datastore issue #17
Merge pull request #19 from juanlizarazo/Juan

Partial chat section migration to new cassandra datastore issue #17
fixes value in the cql dump