Teams, WIP/brainstorming: draft

I'd memoize this so that you don't run `League.find` 6 times in one action:

```ruby
def get_league
  @_league ||= League.find(params[:league_id]
end
```

Here's some more info on memoization: http://gavinmiller.io/2013/basics-of-ruby-memoization/