Merge pull request #1 from benweatherman/master

This pull request solves issue #13 and gets the rate() to return rates
add index to format argument, rate() response is now parsed properly
Merge pull request #16 from htristan/master

Fix for ShipFrom not having a state code (caused invalid XML submission to UPS).
Merge pull request #15 from r3dfish/master

parse rate() response properly
Merge pull request #2 from benweatherman/master

add index to format argument, rate() response is now parsed properly