Allow passed object to be used as string

To avoid breaking changes, a String object is created from the tab name value, then the original properties of the tab object are assigned to this new String object. The passed object can now be used as if it were a string.

packages/components/src/tab-panel/index.js

@@ -91,7 +91,7 @@ class TabPanel extends Component {
 						className="components-tab-panel__tab-content"
 						tabIndex="0"
 					>
-						{ this.props.children( selectedTab ) }
+						{ this.props.children( Object.assign( new String( selectedTab.name ), selectedTab ) ) }
 					</div>
 				) }
 			</div>