Removing exposed TURN ports. (#101)

See: moby/moby#11185

Users of the Portainer frontend are publishing all exposed ports by 
default / accident.  This is causing lockups and crashes on their 
devices.  Since unexposed ports can still be published, and use of the 
internal TURN server is niche this change will save more pain than it 
will cause.  

This should be documented in a FAQ with the myriad issues Portainer can 
cause.

Dockerfile

@@ -77,8 +77,10 @@ VOLUME ["/data"]
 # HTTP Server
 EXPOSE 30000/TCP
 # TURN Server
-EXPOSE 33478/UDP
-EXPOSE 49152-65535/UDP
+# Not exposing TURN ports due to bug in Docker.
+# See: https://github.com/moby/moby/issues/11185
+# EXPOSE 33478/UDP
+# EXPOSE 49152-65535/UDP
 
 ENTRYPOINT ["./entrypoint.sh"]
 CMD ["resources/app/main.js", "--port=30000", "--headless", "--noupdate",\