extract AmazonFlexPay::Util module
extracted AmazonFlexPay::Signature as a class
extract to_hash from to_params, and add consistent to_url
make returnURL a required pipeline parameter, not a late addition
extract endpoint strings
move #submit to make Request objects a little dumber
pipeline methods mimic the api methods
proper modules
organize test dir
embrace ruby 1.9 w/ require_relative
v0.10