Add .travis.yml file for travis-ci.org
Change to public git submodule URL to allow travis-ci to update

See travis-ci documentation here:
http://about.travis-ci.org/docs/user/build-configuration/#Use-Public-URLs-For-Submodules
Add a few entries to .gitignore
Fix typo in URL in .gitmodules
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Update pyfits to astropy.io.fits
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