Added property display: flex and none

Summary:
Fix #241 and successor for #302

Added new property ```display``` with ```YGDisplayFlex``` and ```YGDisplayNone```. Allows to hide nodes from the layout without the need to remove it from the DOM.
Closes https://github.com/facebook/yoga/pull/369

Reviewed By: astreet

Differential Revision: D4501141

Pulled By: emilsjolander

fbshipit-source-id: 0dfeee381f6d1e4bbba81926126b83dd7abab9d6

javascript/sources/nbind.cc

@@ -67,6 +67,7 @@ NBIND_CLASS(Node)
     method(setMarginPercent);
 
     method(setOverflow);
+    method(setDisplay);
 
     method(setFlex);
     method(setFlexBasis);
@@ -125,6 +126,9 @@ NBIND_CLASS(Node)
 
     method(getBorder);
 
+    method(getOverflow);
+    method(getDisplay);
+
     method(getPadding);
 
     method(insertChild);