Added JSHint and JSXHint for linting the code.

assets/js/app.jsx

@@ -0,0 +1,13 @@
+/* This is a fix for Bootstrap requiring jQuery */
+global.jQuery = require('jquery');
+require('bootstrap');
+
+var React = require('react');
+
+// React components
+var WakaTime = require('./components/WakaTime.jsx');
+
+React.render(
+    <WakaTime />,
+    document.getElementById('wakatime')
+);