Added logging and added support for valgrind strategy.

When tests passed, but valgrind failed and valgrind_strategy is fail
![screen shot 2014-09-23 at 20 22 14](https://cloud.githubusercontent.com/assets/1354151/4379461/ddc03232-4360-11e4-8619-7e313237f5ed.jpg)

I'd prefer this default to something other than null.