JSON Rest Store fix for Selects

Due to order of execution of some of the functions within the select mixin, we needed to ensure that the `select.value` was set once the data was loaded. This is particularly the case when using a JSON rest store.

I don't know if this is the optimal way to achieve this, but it's kind of an "urgent" fix. I have tested the regular selects as well as the json store selects and it works fine. I created a test page in `ZoopCommerce` but didn't know how we could fudge this in a test page....possible a delayed `MemoreStore`?