Require specialties at the end of formula.rb

classes in formula_specialties.rb need Formula, so it has to be last.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/formula.rb

@@ -2,7 +2,6 @@ require 'download_strategy'
 require 'formula_support'
 require 'hardware'
 require 'extend/fileutils'
-require 'formula_specialties'
 
 
 # Derive and define at least @url, see Library/Formula for examples
@@ -727,3 +726,5 @@ private
     end
   end
 end
+
+require 'formula_specialties'