Fix USPS error parsing and remove dead code
Handle test case not found
Update failed error xml to be closer to production
Add additional test instead of modifying previous error test
Revert back to original test_error xml
Accidentally removed one too many -
Merge branch 'master' into fix-usps-errors

Conflicts:
	lib/active_shipping/shipping/carriers/usps.rb
	test/unit/carriers/usps_test.rb
handle case where error is returned in tracking info response body
Merge pull request #103 from Shopify/fix-usps-errors

Fix usps errors