[Bugs] #3681 GetBooks NORM: Port to Gtk3

[Sugar Labs Bugs]

#3681: Port to Gtk3
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    Reporter:  humitos      |          Owner:  humitos                    
        Type:  task         |         Status:  new                        
    Priority:  Normal       |      Milestone:  Unspecified by Release Team
   Component:  GetBooks     |        Version:  Unspecified                
    Severity:  Unspecified  |       Keywords:                             
Distribution:  Unspecified  |   Status_field:  Unconfirmed                
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Comment(by humitos):

 Defining custom signals:
  * Gtk3
    * http://python-
 gtk-3-tutorial.readthedocs.org/en/latest/objects.html#objects
  * gtk2
    * http://www.pygtk.org/docs/pygobject/gobject-functions.html

 This is useful to replace the {{{gobject.signal_new}}} call.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3681#comment:1>
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