[GHC] #722: Bring Adrian Hey's StringMap library in the collections package.

[GHC]

#722: Bring Adrian Hey's StringMap library in the collections package.
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    Reporter:  jpbernardy      |        Owner:             
        Type:  task            |       Status:  new        
    Priority:  normal          |    Milestone:             
   Component:  libraries/base  |      Version:  6.4.1      
    Severity:  normal          |     Keywords:  collections
          Os:  Unknown         |   Difficulty:  Unknown    
Architecture:  Unknown         |  
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Bring Adrian Hey's StringMap library in the collections package.

 The interface should be as close a possible to Data.Map, so it can be a
 drop-in replacement in most cases.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/722>
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