[Bugs] #432 NORM: added Activity.get_preview() method

[SugarLabs Bugs]

#432: added Activity.get_preview() method
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    Reporter:  tomeu        |          Owner:  erikos 
        Type:  task         |         Status:  new    
    Priority:  Normal       |      Milestone:  0.84   
   Component:  sugar        |        Version:  0.83.x 
    Severity:  Minor        |       Keywords:  relnote
Distribution:  Unspecified  |   Status_field:  New    
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 we should mention it in the release notes in a section for activity
 developers

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Ticket URL: <http://dev.sugarlabs.org/ticket/432>
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