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
config: first draft (using boost::program_options)

This supports registering command line arguments for different modules
of PFASST++ separately via special static functions.

This introduces dependency on boost::program_options.

see #45
config: registering config options for SDC and AdVec

see #45
config: usage example for command line parameters

Exetuables will need to enable command line options manually.
config: introducing single init function; add quadrature parameters
cmake / travis: fixing Travis and CMake compiler version detection
config: fix GCC build

somehow, GCC has trouble dealing with template specializations and
changes of the storage class in them
travis: fixing Boost ?
tests: 'fixing' Scalar highprec test

deactivated GCC on Travis due to linking problems
another try on fixing Travis
examples: fix van-der-Pol linking