Update submodules.
Merge branch 'master' of git://github.com/clawpack/clawpack

* 'master' of git://github.com/clawpack/clawpack:
  Update all packages.
  Don't import subpackages by default.
switched to relative URLs
Update .travis.yml to install pyclaw
Travis CI: install gfortran
Travis CI: print NumPy version
Travis CI: run nosetests from pyclaw directory
Merge pull request #5 from certik/travis

Get Travis CI working
bringing in Travis CI work
Merge remote-tracking branch 'upstream/master' into riemann_shootout
bringing in relative_urls branch

Merge remote-tracking branch 'origin/relative_urls' into riemann_shootout
bumping pyclaw work