allow tracking packages that have not been delivered
Merge pull request #26 from jlambert121/tracking_fix

allow tracking packages that have not been delivered
Upgrade httparty dependency
Include exception details in tracking events
Removed debug statement from tracking information request
Update Readme.md
Tracking should work with multiple results
Update README
Bump version
Improving error details
Merge pull request #30 from geermc4/master

Improve exception details
Allow customer references to have arbitrary type
Merge pull request #31 from acumenbrands/master

Allow customer references to have arbitrary type
Update Readme.md