[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-3  
Component:  hardware     |   Resolution:           
 Keywords:               |  
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Changes (by jg):

 * cc: dwm2 (added)
  * milestone:  BTest-2 => BTest-3

Comment:

 David, a non-polling battery interface been implemented?  Now we have
 resume working, non-polling on battery is bad.

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Ticket URL: <http://dev.laptop.org/ticket/555#comment:8>
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