Transform the membership list into a user list.
Transform the membership list into a user list.

https://github.com/madewithbytes/us_ignite/issues/220

This will help to reuse the generic sidebar supporters list.

us-ignite/us_ignite,us-ignite/us_ignite,us-ignite/us_ignite,us-ignite/us_ignite,us-ignite/us_ignite