Bumped Riak to 0.9.1

Signed-off-by: David Höppner <0xffea@gmail.com>

* remove version var

Formula/riak.rb

@@ -3,9 +3,9 @@ require 'formula'
 class Riak <Formula
   depends_on 'erlang'
   
-  url 'http://hg.basho.com/riak/get/tip.zip'
+  url 'http://downloads.basho.com/riak/riak-0.9/riak-0.9.1.tar.gz'
   homepage 'http://riak.basho.com'
-  version '0.8'
+  md5 '1f78bb838ae6ded568486b0b56655613'
   
   skip_clean 'log'
   skip_clean 'log/sasl'
@@ -24,4 +24,4 @@ class Riak <Formula
     (prefix + 'data/ring').mkpath
     (prefix + 'data/dets').mkpath
   end
-end
+end