Refactors most controllers and directives into classes for more organized and maintainable code

app/assets/javascripts/directives/functional/snEnter.js

@@ -0,0 +1,14 @@
+/* @ngInject */
+export function snEnter() {
+  return function(scope, element, attrs) {
+    element.bind('keydown keypress', function(event) {
+      if (event.which === 13) {
+        scope.$apply(function() {
+          scope.$eval(attrs.snEnter, { event: event });
+        });
+
+        event.preventDefault();
+      }
+    });
+  };
+}