F connection bundling

bundling connections when they have the same start and end point should work now. the lines should be parallel and change the distance when the money amount gets changed. it also should be shifted when start and end point are swapped.
![connectionBundling](https://f.cloud.github.com/assets/1629265/128710/a86ac87e-6fc5-11e2-8956-cfa0f95050c6.png)