Update to 0.3.0

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-payment-methods/trunk@1012913 b8457f37-d9ea-0310-8a92-e5e31aec5664
Refactor plugin files.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-payment-methods/trunk@1012915 b8457f37-d9ea-0310-8a92-e5e31aec5664