call reactor.removeReader when instance release is requested
call reactor.removeReader when instance release is requested

sreichholf/python-coherence,sreichholf/python-coherence,unintended/Cohen,unintended/Cohen,furbrain/Coherence,coherence-project/Coherence,opendreambox/python-coherence,furbrain/Coherence,opendreambox/python-coherence,ismaelgaudioso/Coherence,ismaelgaudioso/Coherence,coherence-project/Coherence