add Preferences modal(30%done) & move some modules (actions, reducer, socket, store -> lib/~)

lib/components/modal/CreateNewFolder.js

@@ -32,22 +32,22 @@ export default class CreateNewFolder extends React.Component {
       })
       .catch(err => {
         console.log(err)
-        if (err.code === '') {
-          let alert = {
+        var alert
+        if (err.code === 'ECONNREFUSED') {
+          alert = {
             type: 'error',
             message: 'Can\'t connect to API server.'
           }
-        }
-        else if (err.status != null) {
-          let alert = {
+        } else if (err.status != null) {
+          alert = {
             type: 'error',
             message: err.response.body.message
           }
-          this.setState({alert: alert})
-        }
-        else {
+        } else {
           throw err
         }
+
+        this.setState({alert: alert})
       })
   }