Move contributor-creation form for separate view

closes #74

app/controllers/contributors/new.js

@@ -0,0 +1,23 @@
+import Controller from '@ember/controller';
+import { alias } from '@ember/object/computed';
+import { inject as service } from '@ember/service';
+
+export default Controller.extend({
+
+  kredits: service(),
+
+  contributors: alias('kredits.contributors'),
+
+  actions: {
+
+    save (contributor) {
+      return this.kredits.addContributor(contributor)
+        .then(contributor => {
+          this.transitionToRoute('index');
+          return contributor;
+        });
+    }
+
+  }
+
+});