Setup test to verify non-SRD information is not included.

I believe Travis-CI will run for free against a github repo. As long as PRs are used rather than direct merge to master, a simple test script could be written to read the JSON files, and validate the items.
For example, load the `monsters-SRD.json`, loop all the `names` and verify a hard-coded list of `names`. If anyone adds additional, tests fail.