following 576fd81493af76d7be365402b58dcdfa9dae83df, refs #62

I got a compile error with clang 3.7.0 for this one, maybe you want to take
a closer look, @renemilk?

refs #62

refs #62

grid related improvements

# Conflicts:
#	dune/stuff/test/CMakeLists.txt

see http://conan2.iwr.uni-heidelberg.de/git/pdelab/dune-pdelab/issues/58

refs #30

refs #30

Enable testing on travis-ci.org

refs #30

this builds and runs tests w/o ctest first. Errors here will and should
fail our travis build as such. Afterwards ctest is run again on a
cleaned build dir. This should replicate results and submit those to
cdash, while enabling us not to have the travis build fail due to ctest
itself failing.

refs http://conan2.iwr.uni-heidelberg.de/git/pdelab/dune-
pdelab/issues/58