add class_getInstanceVariable to core.js.
add class_getInstanceVariable to core.js.

mralexgray/NodObjC,jerson/NodObjC,jerson/NodObjC,telerik/NodObjC,TooTallNate/NodObjC,mralexgray/NodObjC,telerik/NodObjC,TooTallNate/NodObjC,jerson/NodObjC