MongoDB->Postgres Migration (Part 1 of 2): Migrate team data from Mongoid to ActiveRecord 

![DO NOT MERGE. UNDEAD CODE INSIDE.](http://media.comicbook.com/wp-content/uploads/2012/08/The-Walking-Dead.jpg)

**[Part 2](https://github.com/assemblymade/coderwall/pull/226) contains the code conversion that will be applied after we successfully migrate the data into the new models.**

Well, it's been something we've been talking about for a while. Getting the Team implementation of of Mongoid/MongoDB and over into ActiveRecord/Postgresql. Now we're finally going to push this last mile and gitter dun. 

- [ ] Data migration
  - [x] Create ActiveRecord models to replace the Mongoid models (@seuros)
  - [x] Create a data migration utility to copy the data from MongoDB-backed models into Postgresql-backed models. (@seuros)
  - [x] Create a verification utility to verify that the data is successfully migrated. (@just3ws)
  - [x] Confirm that all the data is successfully migrated using production data. (@just3ws)
  - [ ] Deploy the new models to production (@just3ws)
  - [ ] Run the migration and verification tools in production (@just3ws)