[Hackage] #147: Replace Extension type with (newtyped?) String

[Hackage]

#147: Replace Extension type with (newtyped?) String
--------------------------+-------------------------------------------------
  Reporter:  guest        |        Owner:  ijones   
      Type:  enhancement  |       Status:  new      
  Priority:  high         |    Milestone:  Cabal-1.4
 Component:  Cabal        |      Version:  1.1.6    
  Severity:  normal       |   Resolution:           
  Keywords:               |   Difficulty:  normal   
Ghcversion:  6.4.2        |     Platform:  Linux    
--------------------------+-------------------------------------------------
Changes (by duncan):

  * milestone:  => Cabal-1.4
  * type:  defect => enhancement

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/147>
Hackage <http://example.com/>
My example project