[MacPorts] #15563: Update Groovy port to groovy 1.5.6

[MacPorts]

#15563: Update Groovy port to groovy 1.5.6
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 Reporter:  tomaslin at gmail.com      |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:  Port Bugs                            
Component:  ports                   |     Version:  1.6.0                                
 Keywords:  groovy 1.5.6 java lang  |  
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 Current groovy portFile needs to be updated to the latest version of
 Groovy, which is 1.5.6

 The portFile to do so has been attached

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Ticket URL: <http://trac.macports.org/ticket/15563>
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