Merge pull request #32 from dune-community/python_infrastructure_update

.travis.yml

dune/xt/functions/ESV2007.hh

dune/xt/functions/expression/default.hh

dune/xt/functions/random_ellipsoids.hh

dune/xt/functions/test/builder_definitions.cmake

dune/xt/functions/test/compiles_totals.pickle

dune/xt/functions/test/testruns_totals.pickle

python/CMakeLists.txt

python/dune/xt/CMakeLists.txt

python/dune/xt/bindings.cc

python/dune/xt/functions/__init__.py

python/dune/xt/functions/checkerboard.hh

python/dune/xt/functions/constant.hh

python/dune/xt/functions/expression.hh

python/dune/xt/functions/interfaces.hh

python/dune/xt/functions/spe10.hh