Fixed invalid filename error message
moved --filepath option to separate line in POD synopsis
removed "--" delimiter for <filename> in POD
changed <filename> to <filepath> in POD
clarified relation of <filepath> to other options in POD
reordered options listing in POD to match synopsis
clarified POD options syntax
updated POD to include --github option in synopsis
Merge pull request #34 from diminutivesloop/manpage-cleanup

Documentation cleanup
Merge pull request #33 from diminutivesloop/filename-error-fix

Fixed error message for invalid filename