* Switch to TP_set, FP_set, etc variables for ease of readability
* Converted code to use functions
* use __name__ == '__main__' so we can use compute_stats.py as a module
* Added ignores for test data files to .gitignore
* Added notes on testing to README.md
* Added py.test test to t/test_compute_stats.py
Merge pull request #1 from pvanheus/master

Change to use functions, add test code