Merge pull request #2 from jessicaoros/master

Added Cart Membership Level Pricing
Fixed bug where products were erroneously counted as "subscription products" and thus discounts may not apply. You may have to edit these products and click "update" to get the settings to save correctly.
* Fixed a bug where the get_price filter wasn't running when products/prices were loaded over AJAX (e.g. in the order review).
* Added code to force account creation at checkout if the cart includes a membership level.
Merged .3.2