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

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

@@ -0,0 +1,9 @@
+export { autofocus } from './autofocus';
+export { clickOutside } from './click-outside';
+export { delayHide } from './delay-hide';
+export { elemReady } from './elemReady';
+export { fileChange } from './file-change';
+export { infiniteScroll } from './infiniteScroll';
+export { lowercase } from './lowercase';
+export { selectOnClick } from './selectOnClick';
+export { snEnter } from './snEnter';