Adding Planets to Finders

Added the code to allow the planet position to be overlaid by treating it as another moon. Also added to some code to facilitate reprocessing of the data.  This is for issue #26.

ephem/ephem.py
    - Updated make_moon_dict to include the planet information.

ephem/run_ephem.py
    - Added a run_ephem_main function and made some formatting changes.