[Trac #1168] keyboard shortcuts should work as well as on-screen icons

[Zarro Boogs per Child]

#1168: keyboard shortcuts should work as well as on-screen icons
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 Reporter:  jg                   |       Owner:  maurotorres
     Type:  defect               |      Status:  new        
 Priority:  normal               |   Milestone:  BTest-3    
Component:  calculator-activity  |    Keywords:             
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 I expected to be able to type +, -, *, / symbols on the keyboard and have
 them work, particularly after finding that typing numbers would enter
 them.

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Ticket URL: <http://dev.laptop.org/ticket/1168>
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