added example for van der pol oscillator; corresponding sweeper is copied from scalar example and at the moment not doing anything; compiles
Tailored Newton for van der Pol is now converging ... next step: output and look at solution
van der pol example now running and produces good looking result
van der pol now accepting initial values as arguments
started test for van-der-pol with nu=0, where it is only linear oscillator; not working properly yet
vdp test now running, but there is an inconsistency in the way the solution is wrote into a file
changed parameters
small fixes on vdp oscillator
Merge pull request #90 from Parallel-in-Time/newexample/vanderpol

LGTM