Fix missing Rails. Fix Java symlink. Increase default cpus to 2.

@craigschneider @ChrisPetr0 @rppatel1007 
Bob's vagrant up had some issues so I added what I think will take care of the issues.

I missed the RVM custom attribute for installing Rails that wasn't included in the old chef json, but instead was a modified attributes file. It's a moot point as each project's Bundle would install it anyway, but for the sake of the initial `rails -v` test, I added it back in. Reordered Java above elasticsearch as that is the required ordering. Added the default_java_symlink recipe to fix Ubuntu referring to the wrong Java version. Updated the patch level of elascticsearch. Updated the config_vagrant to default to 2 cpus. Hard coded the omnibus_chef version.