[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:  David.Lin
     Type:  enhancement  |       Status:  assigned 
 Priority:  normal       |    Milestone:  BTest-2  
Component:  hardware     |   Resolution:           
 Keywords:               |  
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Changes (by David.Lin):

  * status:  new => assigned

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:7>
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