Update to JDK8.

Fixes #56.

Instant Answers for JDK8. `fetch.sh` now downloads the docs without anyone having to open a browser before. `parse.py` goes through all `java.*` and `javax.*` files and creates output.

I did not do anything mentioned at https://duck.co/duckduckhack/installing_duckpan, but I'm currently downloading the testing VM and will try to get it running. It would be really nice if someone with experience in fathead answers will take my PR and give it a review.