WIP Details pane + contributor profiles

Adds a 3-pane layout option for showing details, as well as a dashboard
sub-route for showing contributor details in the new details pane.

app/routes/dashboard/contributors/show.js

@@ -0,0 +1,14 @@
+import { inject as service } from '@ember/service';
+import Route from '@ember/routing/route';
+import { alias } from '@ember/object/computed';
+
+export default Route.extend({
+
+  kredits: service(),
+  contributors: alias('kredits.contributors'),
+
+  model(params) {
+    return this.contributors.findBy('id', params.id);
+  }
+
+});