Added flip prop to Toolip (#708)

Co-authored-by: AnnMarieW <amward@fastmail.com>

Author: tcbegley

src/components/tooltip/Tooltip.js

@@ -39,7 +39,9 @@ const Tooltip = props => {
 };
 
 Tooltip.defaultProps = {
-  delay: {show: 0, hide: 50}
+  delay: {show: 0, hide: 50},
+  placement: 'auto',
+  flip: true
 };
 
 Tooltip.propTypes = {
@@ -105,6 +107,12 @@ Tooltip.propTypes = {
     'left-end'
   ]),
 
+  /**
+   * Whether to flip the direction of the popover if too close to the container
+   * edge, default True.
+   */
+  flip: PropTypes.bool,
+
   /**
    * Control the delay of hide and show events.
    */