Nested components (#917)

* Allow components to be passed to NavbarSimple.brand and DropdownMenu.label

* Allow components to be passed to Toast.header

Author: tcbegley

src/components/dropdownmenu/DropdownMenu.js

@@ -151,7 +151,7 @@ DropdownMenu.propTypes = {
   /**
    * Label for the DropdownMenu toggle.
    */
-  label: PropTypes.string,
+  label: PropTypes.node,
 
   /**
    * Direction in which to expand the DropdownMenu. Default: 'down'. `left`

src/components/nav/NavbarSimple.js

@@ -116,7 +116,7 @@ NavbarSimple.propTypes = {
   /**
    * Brand text, to go top left of the navbar.
    */
-  brand: PropTypes.string,
+  brand: PropTypes.node,
 
   /**
    * Link to attach to brand.

src/components/toast/Toast.js

@@ -206,7 +206,7 @@ Toast.propTypes = {
   /**
    * Text to populate the header with
    */
-  header: PropTypes.string,
+  header: PropTypes.node,
 
   /**
    * Set to True to add a dismiss button to the header which will close the