Added detail to docstring and table of expected values for assert
Fixed indentation
ack.py tested and finalized
Created series.py with draft of fibonacci()
Split fibonacci() into helper functions to avoid checking values at each recursion
Added first draft of lucas()
Added values to check lucas(n)
Add first draft of series_sum()
Renamed series_sum() to sum_series(); added assert checks for sum_series()
Add comments to err checking and improved docstrings
Add comments and edit docstring of ack.py