Rename java classes to RubyBar and RubyFoo (as purbon had intended?)

[monkstone]

@purbon I see you had proposed these class name changes (albeit in a fork), I hope you won't be offended but I have re-factored the module (it was failing my minitest), apparently there is no need for the module class to inherit from RubyObject. Further I have added examples where we do ruby to java and java to ruby conversions as would usually be case in real world. I have started documentation but where @enebo do I find the @JavaMethod signature documentation. Actually because I could find a decent reference I created my own https://github.com/jruby/jruby/wiki/Method-Signatures-and-Annotations-in-JRuby-extensions

[monkstone]

@purbon I have now implement a RubyFoo class method as you had intended, the missing bit in your implementation was meta = true which to me shows you should favour minitest over rspec, behaviour is not everything. @enebo hope you don't mind the updating to the commit, I hope you will think it was worth it, I have certainly learned a bit, this guide/documentation is way overdue.

[enebo]

@monkstone yeah this is cool. One other thing possibly worth mentioning is if the name of the java method is the same as the ruby method name then you can omit the name attribute in the annotation. As the extension currently exists in this PR then I do not think there is an opportunity to show that off.

[purbon]

makes complete sense to me, I apologies for not keeping pushing on this, so many thing going on at the same time, but hope to revamp my effort here soon. Thanks for stepping in 👍