USPS Priority Mail Flat Rate Shipping 1.3

Changes since v1.2
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* Added the capability to choose a minimum weight for both sizes of Priority Mail Flat Rate Boxes
* Added the capability to choose a maximum weight for the large Priority Mail Flat Rate Box
* Added the test - if the package weight is less than the small Priority Mail Flat Rate Box minimum
weight or is greater than or equal to the large Priority Mail Flate Rate Box maximum weight, no flat
rate option will appear on the checkout shipping page
* Fixed Tax Class issue (was not showing up in the admin)
* Removed duplicate key entry
* Added support for international shipping
* Updated the english file (description, link, naming, etc.)
* Updated the description
* Updated the screenshots
* Updated the "what I could use help with" section

Enjoy!

Scott

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