Fix typos

src/components/Preferences.react.js

@@ -38,7 +38,7 @@ var Preferences = React.createClass({
     });
     localStorage.setItem('settings.useVM', checked);
     util.isNative();
-    metrics.track('Toggled VM or Native settting', {
+    metrics.track('Toggled VM or Native setting', {
       vm: checked
     });
   },

src/utils/HubUtil.js

@@ -28,7 +28,7 @@ module.exports = {
     return config;
   },
 
-  // Retrives the current jwt hub token or null if no token exists
+  // Retrieves the current jwt hub token or null if no token exists
   jwt: function () {
     let jwt = localStorage.getItem('auth.jwt');
     if (!jwt) {