Minor cleanup in coarse_op.cu.  Fixed error in coarseClover.
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid
Updating multigrid_test to test correctness of coarse operator.
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid

Conflicts:
	tests/Makefile
	tests/multigrid_test.cpp
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid
Testing coarse operator
Merge branch 'multigrid' of https://github.com/lattice/quda into multigrid

Conflicts:
	include/multigrid.h
	lib/coarse_op.cu
	lib/multigrid.cpp