added ErrorModal.jsx && styling error msg

app/components/ErrorModal.jsx

@@ -0,0 +1,23 @@
+var React = require('react');
+
+var ErrorModal = React.createClass({
+  componentDidMount: function (){
+    var modal = new Foundation.Reveal($('#error-modal'));
+    modal.open();
+  },
+  render: function () {
+    return (
+      <div id="error-modal" className="tiny reveal text-center" data-reveal="">
+        <h4>Hey, Excuse me</h4>
+        <p>error: city not found</p>
+        <p>
+          <button className="button hollow warning" data-close="">
+            Try Another city
+          </button>
+        </p>
+      </div>
+    );
+  }
+});
+
+module.exports = ErrorModal;