Migrate from Hector to Binary Java client

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It was announced that new features will not be supported by Thrift and Thrift based Hector and Astynax.

It seems that the only future-proof alternative is https://github.com/datastax/java-driver . It also have shown good performance characteristics.

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CQL3 has some great features and one of them is secondary indexes on collections (C* v2.1): https://issues.apache.org/jira/browse/CASSANDRA-4511 This can replace reverse indexes for labels.