Added Appendable to Java.IO
Added Appendable to Java.IO

AlexeyRaga/eta,pparkkin/eta,rahulmutt/ghcvm,rahulmutt/ghcvm,rahulmutt/ghcvm,AlexeyRaga/eta,pparkkin/eta,AlexeyRaga/eta,pparkkin/eta,AlexeyRaga/eta,pparkkin/eta,AlexeyRaga/eta,rahulmutt/ghcvm,pparkkin/eta,rahulmutt/ghcvm