Updated product class for clarity and set global logging level.
Minor fixes and additions to keep current with UPS API.
Fixed request namespace issue that caused UPS Error 120051
Updated XSD files for UPS API
Updated test case to match product class update
Added Zebra printing label type and support for multiple label formats
Fixed a mistake previously for LABEL_TYPE
Merge pull request #9 from htristan/master

Updates and fixes for UPS API with current changes.