Updated HyperDex Performance Benchmarks

[Robert Escriva]

New performance benchmarks including a more-detailed performance
analysis are available at http://hyperdex.org/performance

While we provide a full analysis at the above URL, the highlights are:

- HyperDex achieves higher throughput than Cassandra and MongoDB
- HyperDex operations complete with low latency for a variety of
benchmarks
- HyperDex works "out of the box" and requires no extra tuning. The
same cannot be said for Cassandra and MongoDB.

Happy hacking,
The HyperDex team