customs, tracking_id, tests, examples
fix shipment doesn't returns much info (bug 110847)
Merge branch 'master' into 109683_customs_and_tracking_id

Conflicts:
	postmaster/__init__.py
Merge pull request #6 from stxnext/109683_customs_and_tracking_id

Adding customs and tracking.
Added Package class with ability to list packages
Updated package to allow creation, with bugs
Merge branch 'add_packages' of https://github.com/kmgreen/postmaster-python into add_packages