WIP: Populate league with default teams

@ShaiNirShado 

I'm starting with a spec to fill a new league with 22 teams (20 players, 1 commish, 1 user.). So far, so good, but I'm not sure how to add the 'type'. I may as well also add here that if I were to change Special column to Type or something of the, sort, do I just ned to change the model and then rebuild the database?

Next step after this is to apply similar methods to make 22 default teams in a league. I'm going to assume the league owner will be able to change their names as he sees fit. Do we want to use the default MLB teams here?
This done() is being called outside the promise chain. That means the tests below might be run before the database is properly populated.
If I were writing this code, I'd have the fillLeague function return a promise that resolves when the database is fully populated. That way you can call done() in a then() function after it finishes.