[Bugs] #2970 UNSP: Ruler: Small fixes

[Sugar Labs Bugs]

#2970: Ruler: Small fixes
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    Reporter:  godiard                    |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Abacus                     |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Small fixes for Ruler activity.

 * The ToolButton must be RadioToolButton.

 * Ruler 8 have a patch file included in the xo.

 * I think collaboration does not work, must set max_participants = 1

 There are not a Ruler component, set to Abacus because is the same
 maintainer :)

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2970>
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