Working on issue #328 - created group and membership models, also some testing
Getting new models registered properly for the admin and adjusting for Madrona learning curve
adding fields to ForestProperty to support #328, rearranging and migrating accordingly.
Adding and removing properties and scenarios to associate them with groups for #328
Proving 'get list of a user's groups' for #328
finishing changes to models to support groups and tests related. Fixes #328
Merge branch 'master' of https://github.com/Ecotrust/land_owner_tools