Hello World with Kokkos

Demonstrates basic interoperability with Kokkos, using Charm++ nodegroup
to spawn a separate instance of Kokkos on each process. It also shows how
command line arguments can be packed to initialize Kokkos on all the processes.

Requires OpenMP build of Kokkos for execution.
e.g. From Kokkos source folder,
> mkdir build-omp
> cd build-omp
> ../generate_makefile.bash --prefix=<absolute path to build-omp> --with-openmp
                            --arch=BDW
> make -j kokkoslib
> make install

Path to OpenMP build of Kokkos should be set in Makefile.common.
