resty - don't strip -x from these scripts

Formula/resty.rb

@@ -4,10 +4,12 @@ class Resty <Formula
   head 'git://github.com/micha/resty.git'
   homepage 'http://github.com/micha/resty'
 
+  # Don't take +x off these files
+  skip_clean 'bin'
+
   def install
     system "mv README.markdown README"
     bin.install %w[pp resty pypp]
-    system "chmod", "a+x", "#{bin}/*"
   end
 
   def caveats; <<-EOS.undent