feat files: Create files and Directories

fix styles.shadows: Follow Material Design's shadow and elevation guide, I like it. 😍

src/js/utils.js

@@ -1,4 +1,5 @@
 import store from 'store';
+import { show } from 'actions/dialog';
 
 export function type(obj) {
   return Object.prototype.toString.call(obj).slice(8, -1);
@@ -23,3 +24,8 @@ export function getKey(object = store.getState().toJS(), key) {
 
   return parent;
 }
+
+export function reportError(err) {
+  let action = show('errorDialog', {description: err.message});
+  store.dispatch(action);
+}