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

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

@@ -0,0 +1,19 @@
+/* @ngInject */
+export function lowercase() {
+  return {
+    require: 'ngModel',
+    link: function(scope, element, attrs, modelCtrl) {
+      var lowercase = function(inputValue) {
+        if (inputValue === undefined) inputValue = '';
+        var lowercased = inputValue.toLowerCase();
+        if (lowercased !== inputValue) {
+          modelCtrl.$setViewValue(lowercased);
+          modelCtrl.$render();
+        }
+        return lowercased;
+      };
+      modelCtrl.$parsers.push(lowercase);
+      lowercase(scope[attrs.ngModel]);
+    }
+  };
+}