Reverted james filter in tags branch

This reverts commit 282786d7e2.

Conflicts:

	lib/liquid.rb
	lib/liquid/variable.rb
	test/if_else_test.rb

lib/liquid/context.rb

@@ -133,9 +133,6 @@ module Liquid
         :blank?
       when 'empty'
         :empty?
-      # filtered variables
-      when SpacelessFilter
-        filtered_variable(key)
       # Single quoted strings
       when /^'(.*)'$/
         $1.to_s
@@ -224,9 +221,5 @@ module Liquid
 
       object
     end
-    
-    def filtered_variable(markup)
-      Variable.new(markup).render(self)
-    end
   end
 end