Support mute in presets
Support mute in presets

Resolves #153
Having a mute flag on the player specification in a preset will now turn
it on off baed on boolean flag.

pettersamuelsen/node-sonos-http-api,pettersamuelsen/node-sonos-http-api,craigmillerdev/node-sonos-http-api,jzajac2/node-sonos-http-api,craigmillerdev/node-sonos-http-api,jishi/node-sonos-http-api,jzajac2/node-sonos-http-api,jishi/node-sonos-http-api,jzajac2/node-sonos-http-api