Merge pull request #76 from kracekumar/master

Changed three to four in nodes.py at line no 107

diff --cc jinja2/nodes.py
index c14f8e386692cd72378d53eaddcb8ee761214fb5,c827e2b3001ba1b4428cf0681de1608abf881be3..7e5229e0198570c3be99c8f75397564cb63a4660
--- 1/jinja2/nodes.py
--- 2/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@@ -103,9 -102,9 +103,9 @@@ def get_eval_context(node, ctx)
      return ctx
  
  
 -class Node(object):
 +class Node(six.with_metaclass(NodeType, object)):
      """Baseclass for all Jinja2 nodes.  There are a number of nodes available
-     of different types.  There are three major types:
+     of different types.  There are four major types:
  
      -   :class:`Stmt`: statements
      -   :class:`Expr`: expressions