cleans up payment for issue #291

cleans up payment for issue #291
cleans up paypal_payment for issues #183 & #291

cleans up paypal_payment for issues #183 & #291
cleans up amazon_payment for issues #183 & #291

cleans up amazon_payment for issues #183 & #291
cleans up billing for issues #183 & #291

cleans up billing for issues #183 & #291
form on wrong page #183

form on wrong page #183
bugfix for payment button display #183
Merge pull request #313 from chris18890/issue183

Cleans up payment & billing modules for issues #183 & #291