Added packages needed by oab-java

I ran into a problem where the AMI ended up being bad because java was never built. The error is here: https://gist.github.com/jeremyharris/0fe6d53c108028ed8f66#file-gistfile1-txt-L57

I tried to inspect the oab-java log while puppet was installing it but for some reason it never generated a log. Then I booted up the bad AMI, ran `oab-java.sh` manually and dealt with the errors one at a time. It turned out it wouldn't install because it was missing certain packages here and there, which I added.

After adding these packages and running it again, the AMI built correctly and ran successfully using Minecloud.

P.S. Thanks for this project - it saved me a ton of time and effort and turned out better than what I was probably going to end up with :)