Bug 1066344 platforms to read from platforms

@rhelmer r?

So, `/plaforms/` doesn't have the `display: True/False` which the hardcoded stuff in `models.Platforms` used to have. 
So, instead of hacking that into the middleware service, I apply it inside the `models.Platforms.get` method. 

`/daily/` and `/query/` now work but perhaps best you try it too yourself.