[sql lab] allow users to save their queries (#2528)

* Allow users to save their queries

Fixing tests .

* Adding placeholder for Query Description

* initJQueryCSRF -> initJQueryAjaxCSRF

superset/assets/javascripts/SqlLab/components/AlertsWrapper.jsx

@@ -0,0 +1,18 @@
+import React from 'react';
+import AlertContainer from 'react-alert';
+
+export default class AlertsWrapper extends React.PureComponent {
+  render() {
+    return (
+      <AlertContainer
+        ref={ref => {
+          global.notify = ref;
+        }}
+        offset={14}
+        position="top right"
+        theme="dark"
+        time={5000}
+        transition="fade"
+      />);
+  }
+}