Make each testcase run separately with multiprocesses by default.
Make each testcase run separately with multiprocesses by default.

The default behaviour of multiprocesses is to run each test CLASS in one go
and seed data/fixtures once. We, however, want each test case run and
data/fixtures seed separately.

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son