EventEmitter: .emit() binds listeners before calling them, works if listeners remove themselves
EventEmitter: .emit() binds listeners before calling them, works if listeners remove themselves

fix #28

Escaux/SIP.js,joseph-onsip/SIP.js,markandrus/SIP.js,onsip/SIP.js,onsip/SIP.js,josephfrazier/SIP.js,ronlobo/SIP.js,Voiceworks/SIP.js