Add ability for overriding the shop templates more easily.

git-svn-id: https://plugins.svn.wordpress.org/orillacart/trunk@861174 b8457f37-d9ea-0310-8a92-e5e31aec5664
Shipping rates bug fix.

git-svn-id: https://plugins.svn.wordpress.org/orillacart/trunk@862816 b8457f37-d9ea-0310-8a92-e5e31aec5664