[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-4  
 Component:  hardware     |     Version:           
Resolution:               |    Keywords:  power    
  Verified:  0            |  
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Changes (by jg):

  * keywords:  => power
  * verified:  => 0

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:10>
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