SUPEE-4291/4334 - This patch addresses the USPS API changes

This is an official Magento patch.

This patch addresses the USPS API changes that went effective on Sep. 7th2014

see http://magento.com/blog/developers/usps-api-update-what-you-need-know
Merge pull request #4 from macopedia/SUPEE-4291_4334

SUPEE-4291/4334 - This patch addresses the USPS API changes