Removed two missing properties from kineticjs

Both `Polygon` and `Transition` dont seem to be present anymore in the current version of KineticJS. I'm not an expert of KineticJS, which means I could be wrong of course.
yup [was in v4 ](http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.4.0.js)
 
![image](https://cloud.githubusercontent.com/assets/874898/3980483/26477e66-2863-11e4-8566-b9bd7262dae1.png)

not in latest :+1: