Add Kinds endpoint for listing
Replace Place.KINDS constant calls by Kind.codes
Better Kind.all. Thanks to @mehlah :heart:
Merge pull request #21 from mainelabs/kinds-endpoint

Kinds endpoint
Add search panel to Places#index
Let the user close a Place when viewing it (and going back to the search)
Rename code into id, as Emberjs need an id field
Display kinds checkboxes