Bump version number to 1.5.5

Ready to make the 1.6 branch

Cabal.cabal

 Name: Cabal
-Version: 1.5.4
+Version: 1.5.5
 Copyright: 2003-2006, Isaac Jones
            2005-2008, Duncan Coutts
 License: BSD3
@@ -51,7 +51,7 @@ Library
   Build-Depends: filepath >= 1 && < 1.2
 
   GHC-Options: -Wall
-  CPP-Options: "-DCABAL_VERSION=1,5,4"
+  CPP-Options: "-DCABAL_VERSION=1,5,5"
   nhc98-Options: -K4M
 
   Exposed-Modules:

releaseNotes

@@ -9,8 +9,6 @@ changes and installation instructions.
 
 DOWNLOAD:
 
-The Haskell Cabal has reached development version 1.5.3
-
 Download the Cabal library here (source tarballs available):
 http://www.haskell.org/cabal/download.html