Merge pull request #60 from a-team/master

Avoid creating singleton classes on nil, true and false objects

lib/liquid/extensions.rb

@@ -43,14 +43,20 @@ class Date  # :nodoc:
   end
 end
 
-def true.to_liquid  # :nodoc:
-  self
+class TrueClass
+  def to_liquid  # :nodoc:
+    self
+  end
 end
 
-def false.to_liquid # :nodoc:
-  self
+class FalseClass
+  def to_liquid # :nodoc:
+    self
+  end
 end
 
-def nil.to_liquid # :nodoc:
-  self
-end
+class NilClass
+  def to_liquid # :nodoc:
+    self
+  end
+end