Add MarkupSafe library to third_party (dependency for Jinja2 2.7)

third_party/markupsafe/_native.py

 # -*- coding: utf-8 -*-
 """
     markupsafe._native
     ~~~~~~~~~~~~~~~~~~
 
     Native Python implementation the C module is not compiled.
 
     :copyright: (c) 2010 by Armin Ronacher.
     :license: BSD, see LICENSE for more details.
 """
-from jinja2._markupsafe import Markup
+from markupsafe import Markup
+from markupsafe._compat import text_type
 
 
 def escape(s):
     """Convert the characters &, <, >, ' and " in string s to HTML-safe
     sequences.  Use this if you need to display text that might contain
     such characters in HTML.  Marks return value as markup string.
     """
     if hasattr(s, '__html__'):
         return s.__html__()
-    return Markup(unicode(s)
+    return Markup(text_type(s)
         .replace('&', '&amp;')
         .replace('>', '&gt;')
         .replace('<', '&lt;')
         .replace("'", '&#39;')
         .replace('"', '&#34;')
     )
 
 
 def escape_silent(s):
     """Like :func:`escape` but converts `None` into an empty
     markup string.
     """
     if s is None:
         return Markup()
     return escape(s)
 
 
 def soft_unicode(s):
     """Make a string unicode if it isn't already.  That way a markup
     string is not converted back to unicode.
     """
-    if not isinstance(s, unicode):
-        s = unicode(s)
+    if not isinstance(s, text_type):
+        s = text_type(s)
     return s