version 1.0200 - September 17, 2015
 * Added max_weight attribute to box types so that boxes span based upon weight. Defaults to 1000.

version 1.0100 - September 11, 2015
 * Added new sort algorithm: sort_items_by_z_desc_A
 * Integration with Travis (cakirke)
 * Fixed hash key sorting (cakirke)
 * Fixes for Kwalitee errors (openstrike)

version 1.0001 - September 28, 2014
 * Declaired Data::GUID dependency.

version 1.0000 - June 23, 2014
 * No longer a wrapper of a web service. Exposed code behind the web service as it's own public module.

version 0.0501 - Novemver 6, 2012
 * Fix some cosmetic problems.
 * Added some parameter validation for the shipping_options method.

version 0.0500 - November 6, 2012
 * NOT backwards compatible.
 * Now works asynchronously.
 * Add SSL to web service.
 * Add shipping_options method which returns USPS postage rate calculations.

version 0.0400 - October 25, 2012
 * First public release to web service.