separates lloyds clustering from planarisation

* old component hidden
* replaced with two new ones (lloyds and planarise)
* mesh passed between as polyline face boundaries
* minor tweaks to backend to allow planarisation without lloyds clustering

![image](https://cloud.githubusercontent.com/assets/121068/4073630/e8f6f214-2e96-11e4-950f-dc8b33eca224.png)