Merge pull request #1 from maryrood/master

Added a median function to the script.  Enjoy!
Added a median function to stats.py
I added tests to the median function
Merge pull request #1 from junjieguo2007/median-tests

Median tests
Merge remote-tracking branch 'upstream/master'
Added median function
Changed period to exclamation.
Merge pull request #1 from maryrood/median

Median