Purchase via Woo/EDD snippets -- add support for multiple memberships

[ashleyfae]

[mihaijoldis]

I was just looking to see if this works for Woo or not.
Just had someone that had this issue and he said instead of a new membership it renewed the existing purchase

[mihaijoldis]

In fact i was mistaken, it aparently works fine with MU and when you purchase the same product again it renews the membership.