[Bugs] #1296 UNSP: close collaboration tube after the activity window is destroyed

[SugarLabs Bugs]

#1296: close collaboration tube after the activity window is destroyed
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    Reporter:  tomeu                      |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 So activities can do collaboration cleanup when the activity window is
 closed.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1296>
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