Adds instant payment notification for Amazon Payments.
Fixes php notice caused by checking user id when not logged in.
Merge branch 'dev' of github.com:elplatt/seltzer into dev
Verify signature before saving amazon IPN payment, close #149.
Fix upgrade of user module, close #113.
Fix upgrade of member module from 2 to 3.
Force int values for plan voting/active field for #144.
Add default for hash/salt field for #145.
When crm_get_data() is called with invalid type, die with error, fix #127.