Create a suite of benchmarking and stress tests for the pyzor server

[alexkiro]

In order to evaluate various improvements and new technologies we are considering adding to the pyzor server we would require a suite of tests.

[alexkiro]

A brief summary of benchmarking results. This is using a pyzord server with mysql engine and no multi-treading/multi-processing activated as a baseline.

• Using Gevent gives a 10% performance increase
• Using Redis instead of MySQL gives a 10% performance increase
• Using multi-threading gives a 50% performance decrease (although this does mean that we would be able to handle multiple connections at a time, so it might be better with real life traffic)
• Using PyPy instead of CPython gives a staggering 400% performance increase, with a considerable bigger start-up cost.
• Using PyPy instead of CPython and multi-threading gives the same 400% performance increase.

Would also be interesting to see how Python3 performs.