[Trac #555] Add PM event for battery status change

[Zarro Boogs per Child]

#555: Add PM event for battery status change
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 Reporter:  krstic       |        Owner:  mfoster
     Type:  enhancement  |       Status:  new    
 Priority:  normal       |    Milestone:  BTest-2
Component:  hardware     |   Resolution:         
 Keywords:               |  
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Changes (by reynaldo):

 * cc: reynaldo at opendot.cl (added)

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:1>
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