Update homebrew formula to 1.5.0 for 64-bit; keep 1.4.1 for 32-bit.

pypy.diff

diff --git a/Library/Formula/pypy.rb b/Library/Formula/pypy.rb
index ace63b2..cb79dad 100644
--- a/Library/Formula/pypy.rb
+++ b/Library/Formula/pypy.rb
@@ -3,14 +3,15 @@ require 'hardware'
 
 class Pypy < Formula
   if MacOS.prefer_64_bit?
-    url 'http://pypy.org/download/pypy-1.4.1-osx64.tar.bz2'
-    md5 '769b3fb134944ee8c22ad0834970de3b'
+    url 'http://pypy.org/download/pypy-1.5-osx64.tar.bz2'
+    md5 'b1417916bc01ebb9f95c666f5e397fb5'
+    version '1.5.0'
   else
     url 'http://pypy.org/download/pypy-1.4.1-osx.tar.bz2'
     md5 '8584c4e8c042f5b661fcfffa0d9b8a25'
+    version '1.4.1'
   end
   homepage 'http://pypy.org/'
-  version '1.4.1'
 
   def install
     prefix.install ["bin", "lib-python", "lib_pypy"]