Use expanduser and different constructors in sources.
New url format.
Updated README.rst to reflect url change.
Fixed expanduser.
Raise argparse.ArgumentTypeError instances when parsing bad arguments.
Properly reset key when parsing arguments.
Two-step process for discovering files.
ZipSource supports new two-step discovery.
TarSource supports two-step discovery.
Support inclusion/exclusion based on filenames.
Updated README.rst.
Next version will be 0.3.