Stop recommending our pip

Seeing as the pip formula doesn't recommend pip anymore, we should stop telling people to use it :P

Library/Homebrew/blacklist.rb

@@ -26,7 +26,7 @@ def blacklisted? name
   when 'mercurial', 'hg' then <<-EOS.undent
     Install Mercurial with pip:
 
-        brew install pip && pip install mercurial
+        easy_install pip && pip install mercurial
 
     Or easy_install:
 

Library/Homebrew/download_strategy.rb

@@ -364,11 +364,7 @@ class MercurialDownloadStrategy <AbstractDownloadStrategy
   def cached_location; @clone; end
 
   def fetch
-    raise "You must install mercurial, there are two options:\n\n"+
-          "    brew install pip && pip install mercurial\n"+
-          "    easy_install mercurial\n\n"+
-          "Homebrew recommends pip over the OS X provided easy_install." \
-          unless system "/usr/bin/which hg"
+    raise "You must `easy_install mercurial'" unless system "/usr/bin/which hg"
 
     ohai "Cloning #{@url}"