[explore-v2] add fave star and edit button to chart header (#1623)

* add fave star to chart title

* add TooltipWrapper, and css for icons

* fix linting

superset/assets/javascripts/components/TooltipWrapper.jsx

@@ -0,0 +1,28 @@
+import React, { PropTypes } from 'react';
+import { Tooltip, OverlayTrigger } from 'react-bootstrap';
+import { slugify } from '../modules/utils';
+
+const propTypes = {
+  label: PropTypes.string.isRequired,
+  tooltip: PropTypes.string.isRequired,
+  children: PropTypes.node.isRequired,
+  placement: PropTypes.string,
+};
+
+const defaultProps = {
+  placement: 'top',
+};
+
+export default function TooltipWrapper({ label, tooltip, children, placement }) {
+  return (
+    <OverlayTrigger
+      placement={placement}
+      overlay={<Tooltip id={`${slugify(label)}-tooltip`}>{tooltip}</Tooltip>}
+    >
+      {children}
+    </OverlayTrigger>
+  );
+}
+
+TooltipWrapper.propTypes = propTypes;
+TooltipWrapper.defaultProps = defaultProps;