Merge java version into master

[Mkerian10]

Adds java version, doing 5-9 card evaluation. Addresses issue #5

[HenryRLee]

Thanks @Mkerian10 for the hard work. Generally they look good to me. Just a few change requests, and then I'll merge this PR:

I see some binary files committed, as well as many cache files, history files and lock files. Do you think they should be deleted?

The other request is that can you change the package name from evaluator to phevaluator? So that the name matches the Python package name and C++ namespace.

[Thomas-MMJ]

None of the files in .gradle should be merged, those are local build files that appear to have been committed by accident. Same with the folder gradle/wrapper.

Only the file java/build.gradle and the folder java/src (and all files and subdirectories of java/src) should be merged.