Retrieve mmsi from the full model about aisreporter

[stevepmitchell]

Could this be why when I try to use this, SignalK crashes with an error about not being able to read an MMSI value?

`Feb 3 06:38:38 grace signalk-server[11819]: /usr/lib/node_modules/signalk-server/node_modules/@signalk/aisreporter/index.js:31

Feb 3 06:38:38 grace signalk-server[11819]: var mmsi = app.config.settings.vessel.mmsi
Feb 3 06:38:38 grace signalk-server[11819]: ^

Feb 3 06:38:38 grace signalk-server[11819]: TypeError: Cannot read property 'mmsi' of undefined
Feb 3 06:38:38 grace signalk-server[11819]: at Object.plugin.start (/usr/lib/node_modules/signalk-server/node_modules/@signalk/aisreporter/index.js:31:42)
Feb 3 06:38:38 grace signalk-server[11819]: at err (/usr/lib/node_modules/signalk-server/lib/interfaces/plugins.js:179:18)
Feb 3 06:38:38 grace signalk-server[11819]: at FSReqWrap.oncomplete (fs.js:123:15)`

[tkurki]

This should now be fixed in version 0.0.4.