Include .py files in the PyPi package
Add a test for loading a NcML filepath
Rework loading of the ncml object so files are more supported
Add a 'apply_to_members' argument option to allow straight aggregations.

By default, pyncml will apply NcML to all aggregation members before
extracting metadata.  This can take along time on huge aggregations and may
not always be needed.  This new option allows the user to turn off applying
NcML to each individual member.
Add a logging line to show the size of the aggregation before processing