Students T-Test

Added functions for Students T-Test one sample and independant sets and a function to convert a t-value to a p-value. Not sure about the naming, if you would like me to change the function names and resubmit requrest, let me know. I have tests, I will add examples next week and I would like to add dependant sets after that.
This becomes sort of moot I feel since it will be in stat/test. The name should become OneSampleT or near equivalent, at that point the comment should follow the standard.

> Comments are usually of the form "FunctionName computes/returns...". Please run golint.