Custom routes registered first, so collection are not overriden by the show default route

[standuprey]

  comments = this.resource('comments', function() {
    this.collection.get('search');
    this.member.get('reply');
  });

the 'search' action was registered after the default mapping, so comments/search was redirected to the comment's show action with search as id, and never reached the 'search' custom action.

This pull request makes sure that the custom actions are registered first and thus not caught be the default mapping

It also corrects a bug that made the "before" option not working on custom actions