Add exports for custom propTypes as shape specs rather than the complete shape

Allows easier composition of the shapes in case we need to extend them
in components later

js/components/prop_types/current_user_shape.js

@@ -3,10 +3,15 @@ import React from 'react';
 
 const { number, object, shape, string } = React.PropTypes;
 
-export default shape({
+const currentUserShapeSpec = {
     acl: object,
     email: string,
     id: number,
     profile: object,
     username: string
-});
+};
+
+export default shape(currentUserShapeSpec);
+export {
+    currentUserShapeSpec
+};

js/components/prop_types/index.js

@@ -1,5 +1,5 @@
-export { default as currentUserShape } from './current_user_shape';
-export { default as whitelabelShape } from './whitelabel_shape';
+export currentUserShape from './current_user_shape';
+export whitelabelShape from './whitelabel_shape';
 
 // Re-export PropTypes from react-router
 export { locationShape, routerShape } from 'react-router/es6/PropTypes';

js/components/prop_types/whitelabel_shape.js

@@ -3,9 +3,14 @@ import React from 'react';
 
 const { shape, string } = React.PropTypes;
 
-export default shape({
+const whitelabelShapeSpec = {
     name: string,
     subdomain: string,
     title: string,
     user: string
-});
+};
+
+export default shape(whitelabelShapeSpec);
+export {
+    whitelabelShapeSpec
+};