JRuby compatible mode

[nengxu]

Could you please create a JRuby compatible mode?

By default, c extension is disabled in JRuby and possibly not supported in the future.

Now one of the dependencies, pry-stack_explorer, requires binding_of_caller which has c extension.

Thanks.

[ruprict]

I am pretty sure that pry-debugger requires C stuff too.

[mjc]

I would love to be able to use jazz_hands on jruby as well, currently I have to platform: :mri it and then manually enable whatever does work in jruby.