Travis CI: Fail build if regenerated xref and grammar files don't match those in repository #780
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This patch causes the Travis CI builds to fail if they detect that the newly generated grammar and xref files differ from those committed to the git repository.
Figure PDFs are currently ignored as regenerated PDFs will always differ from the committed PDFs due to changed metadata (build date/time, primarily). If a better solution for diffing the PDFs is found, we can add this test in the future.
This PR follows the discussion near the end of #635.