first draft of ack.py, function produces correct results, needs assert statements
First draft of series.py, with working functions for fibonacci, lucas, and sum series, needs docstrings and better test methods
added docstrings and more extensive tests and commented those tests.
add testing to ack.py to check function output against expected values, small copyedits to series.py
removed unnecessary step of adding function return values to a list before testing
Merge pull request #35 from henrykh/master

Session 2 HW (ack.py and series.py)