Merge branch 'release/0.0.3'
first version of the aviles giga problem implemented, with splitting
working impl euler newton krylov strategie
first example thingy for aviles giga as ipython notebook
changed order of functions
removing uneccessary files
Merge branch 'feature/aviles-giga-problem' into release/0.0.4

Signed-off-by: Torbjörn Klatt <t.klatt@fz-juelich.de>
Merge branch 'release/0.0.4'
cleanup: moved integrators to utilities (preparing rename)
cleanup: renamed integrators to quadrature
cleanup: also renaming corresponding tests
cleanup: adjusting docu for integrators->quadrature renaming
cleanup: moved and renamed solver cores -> integrators
cleanup: integrators: moved sdc into own submodule
cleanup: integrators: module init tweaks
levels: first draft of levels
cleanup: integrators: further renamed integrators
levels: glueing integrators to time levels
multi level provider: starting rewrite of MultilevelProvider

TODO: add transitioners
tests: first dummy test for abstract levels

TODO: probably need to remove hierarchy position from levels