Moved inventors xpath logic repeated in apps and grants into a singular method.  Changed filename selection behavior to ignore file extension.  This is because (...) extract report ipa123456.xml is a perfectly valid operation which was previously not allowed due to the user's addition of the .xml extension.  Added a warning that file extensions are ignored when one is detected in the filename selection.  Cleaned up spacing for equals signs in the ArgumentsParser class.
Merge pull request #21 from ahirschberg/master

Moved inventors xpath logic repeated in apps and grants into a singular ...