Expose dirtied func in Javascript bindings (#842)

Summary:
Yoga currently has the concept of a 'dirtied func', which is called when a Node becomes dirty, which can be useful to trigger a repaint. This PR exposes that functionality in the Javascript bindings.
Pull Request resolved: https://github.com/facebook/yoga/pull/842

Reviewed By: SidharthGuglani

Differential Revision: D13847093

Pulled By: davidaurelio

fbshipit-source-id: 41913abd6eedc46ee7d66929140e08a084f23972

javascript/sources/nbind.cc

@@ -155,6 +155,9 @@ NBIND_CLASS(Node)
     method(setMeasureFunc);
     method(unsetMeasureFunc);
 
+    method(setDirtiedFunc);
+    method(unsetDirtiedFunc);
+
     method(markDirty);
     method(isDirty);