Merge pull request #1 from dmnielsen/master

Added median function to stats.py
Merge pull request #1 from dmnielsen/master

Added median function to stats.py
I've added tests for your awesome median function.
I added a median test to make sure the median of 1 number is that number.
Merge branch 'median_tests' of https://github.com/astrophysaxist/simplestats