Parallel petclaw tests in Travis
Enable use of pyclaw.io.x where x!=ascii.

Also, fix some problems in pyclaw.io.netcdf.
I still doubt that it's working correctly.
Clean up 3D acoustics test
Improve nosetest output (use test descriptions)
Merge pull request #406 from ketch/enable_netcdf

Enable use of pyclaw.io.x where x!=ascii.
Serialize extension module auto-build in Rossby
Merge remote-tracking branch 'origin/master' into ahmadia/travis_test_petclaw