Added a test for create_comm_with_list.
Added tests for invalid comm creation.
Added test for mpi_type_for_ndarray.
Added standard file metadata to new files.
Merge branch 'master' into test-mpiutils
Added comments re not using standard test case, and trimmed overly broad test.
Merge branch 'master' into test-mpiutils
Removed overly literal copypasta.
Consolidated tests.
Merge pull request #206 from enthought/test-mpiutils

Test mpiutils