net and background calculated on the fly by @property
added testing folder
Changed the times array from a seconds time, to an array of the time bins for each step
Additional tests on LightCurve object
Added beginning script to test cos extraction, no tests yet
Syntax changes
began re-work extraction of COS data to using the np.histogram method instead of iterating over the hdus
Added kwargs for LightCurve initialization, changed __add__ behavior.  Added tests for operations
Enabled proper truncation of events with uneven steps.  Added creation of test FUV fits file and tests for extraction.
modified command line script to reflect changes to operations
Fixed duplicated counts column in writing out to fits file, now GROSS is there too