[MacPorts] #20784: yaml-mode.el: update to 0.0.4

[MacPorts]

#20784: yaml-mode.el: update to 0.0.4
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 Reporter:  ryandesign@…             |       Owner:  michael.dagitses@…        
     Type:  update                   |      Status:  new                       
 Priority:  Normal                   |   Milestone:                            
Component:  ports                    |     Version:  1.7.1                     
 Keywords:                           |        Port:  yaml-mode.el              
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 yaml-mode.el should be updated to 0.0.4. It looks like the download
 location should also be changed because the project moved.

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Ticket URL: <http://trac.macports.org/ticket/20784>
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