Merging this now since it's basically functional and we're about to split the repo.

instead default to activate dune-common's

passing args thru ninja didn't work as intended

Conflicts:
	.travis.yml

Resolved to remote version.

the number of targets allowed to fail

this actually controls what make binary is used in autofools projects,
apparently

This was not actually the issue.
This reverts commit 13227922cb6f9ed1ff628c9b17753cfc4e7045b2.

Conflicts:
	.travis.yml
	dune/stuff/test/grid_provider_cube.cc
	dune/stuff/test/grid_provider_dgf.cc
	dune/stuff/test/grid_provider_gmsh.cc

Resolved grid_provider files to local (deleted).
Resolved travis.yml to local except that it includes the new licence header now.