Fix parallel mpi tests to work with < 4 processors.
Remove obsolete benchmarks directory.
`assert` is a statement.
Merge pull request #410 from cowlicks/bmarks

Remove obsolete benchmarks directory.
Merge pull request #408 from enthought/bugfix/fix-test_create_comm_with_list-for-less-than-4-processes

Fix parallel mpi tests to work with < 4 processors.
Add @kwmsmith's fix for atexit cleanup errors.
Merge pull request #413 from enthought/bugfix/assert-is-a-statement

`assert` is a statement.
Merge pull request #414 from enthought/bugfix/atexit-cleanup-errors

Add @kwmsmith's fix for DistArray.__del__ errors.
Make `comm` first required argument for local distributions.

Updates testsuite.
Merge branch 'master' into bugfix/144