Add timing checks to testing

Add some rough timing checks to testing script.  

It is really easy to make small code changes that drastically change the speed 
of ballot processing or methods.  This way we will be aware of how changes 
affect speed and we can knowingly make the trade off.

I'm thinking there will be a file not under version control with speeds for 
that machine.  In testing, we can have some kind of threshold, e.g., +- 10 
percent.

Original issue reported on code.google.com by jeff.oneill on 29 Jul 2010 at 2:00

skidooesy / stv

Add timing checks to testing #48