Add back parallel hdf5 testing for linux only.
Add back parallel hdf5 testing for linux only.

Try using a xvfb on os x.

Fix spacing.

Tweak OS X Xvfb command.

Add a comment.  Mostly trying to trigger a travisci build.

Hopefully fix .yaml.

Try again.

Try again.

RaoUmer/distarray,enthought/distarray,RaoUmer/distarray,enthought/distarray