#1686 NORM Untriag: xo activity bundles should be autodetectable by magic

[Zarro Boogs per Child]

#1686: xo activity bundles should be autodetectable by magic
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 Reporter:  tomeu   |       Owner:  tomeu    
     Type:  defect  |      Status:  new      
 Priority:  normal  |   Milestone:  Untriaged
Component:  sugar   |     Version:           
 Keywords:          |    Verified:  0        
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 We should do something similar to OpenDocument docs, where an uncompressed
 mimetype file containing the mime type is stored inside the zip.

 This way we'll be able to determine the content by sniffing the first
 bytes, not depending on the extension.

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Ticket URL: <http://dev.laptop.org/ticket/1686>
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