Update BSpline.java
Update BezierSpline.java

Updated bezierspline
Update CubicSpline.java

Updated Cubicspline. Not fully working but close, mathematical error somewhere in the code.
Update BezierSpline.java

Tidier ;)
Working cubicspline class

It works!
Merge branch 'fabian'
Merge branch 'master' into fabian
More working gui.