AR Enum support in resource models

[robinboening]

Is your feature request related to a problem? Please describe.
A resource model in Alchemy integrates nicely in the CRUD views. If my model has an enum defined it is treated as an integer (which makes sense as it is an integer column in the db).

Describe the solution you'd like
It would be nice if we would support ActiveRecord enums so that the forms actually renders a select box for the different values in a human friendly way.

I think I could quickly come up with a PR for this.

[tvdeyen]

Please do. I like that idea.

[robinboening]

Resolved by #2210. Closing.