Seed data command

[jamesplease]

I'm not sure if seeding should go into this lib, or if it should be an external lib. But being able to write seed data as JSON or JS could be pretty handy. Just imagine...

cats.json

{
  "resource": "cats",
  "data": [
    { },
    { },
    { }
  ]
}

and then...

pls seed ./seeds

Could be cool. Right?