Integrate presence in Labyrinth activity

[llaske]

Integrate presence handling into Labyrinth activity to allow playing the activity with other users on the network. So users could create a collaborative mind map.

You should add the presence palette and integrate presence like explained in the tutorial here: https://github.com/llaske/sugarizer/blob/dev/docs/tutorial_step6.md
See code for Labyrinth activity here: https://github.com/llaske/sugarizer/tree/dev/activities/LabyrinthJS.activity
You could use the SharedNotes activity source code to see how handle presence in a similar context (Cytoscape framework). See code for the SharedNotes activity here: https://github.com/llaske/sugarizer/tree/dev/activities/SharedNotes.activity

[lohani2280]

@llaske I would like to work on this issue.

[llaske]

@lohani2280 Sure, you're welcome.

[llaske]

Fixed in #274

[llaske]

Closed in dd3c58d