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

app/assets/javascripts/controllers/index.js

@@ -0,0 +1,7 @@
+export { PureCtrl } from './abstract/pure_ctrl';
+export { EditorPanel } from './editor';
+export { Footer } from './footer';
+export { NotesPanel } from './notes/notes';
+export { TagsPanel } from './tags';
+export { Root } from './root';
+export { LockScreen } from './lockScreen';