[MacPorts] #20368: NLTK Ports upgrade to 2.0b5

[MacPorts]

#20368: NLTK Ports upgrade to 2.0b5
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 Reporter:  stevenbird1@…          |       Owner:  macports-tickets@…                   
     Type:  update                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  1.7.1                                
 Keywords:                         |        Port:  py-nltk, py25-nltk, py26-nltk        
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Comment(by stevenbird1@…):

 I updated the portfiles to include a py-yaml dependency, and to give new
 checksums for an updated package (omitting yaml).

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Ticket URL: <http://trac.macports.org/ticket/20368#comment:1>
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