Making suggestion

WIP
1) Suggestion is created but with the wrong id, has incrementing parent id (fixture-0, fixture-1, etc) instead of its own (100, 101, etc).
2) Error is thrown in the console:
`Uncaught Error: Assertion Failed: You can only add a 'initiative' record to this relationship`
3) template does not display saved suggestion (probably because of 2)).
this.resource('suggestions', function() {
  this.route('new'); // /initiatives/1/suggestions/new