Add MarkupSafe library to third_party (dependency for Jinja2 2.7)

third_party/markupsafe/_native.py

Index: third_party/markupsafe/_native.py
diff --git a/third_party/jinja2/_markupsafe/_native.py b/third_party/markupsafe/_native.py
similarity index 86%
copy from third_party/jinja2/_markupsafe/_native.py
copy to third_party/markupsafe/_native.py
index 7b95828ec87f7e7e2c8af4e5ce343eedbe3fa038..5e83f10a117c4717975327337ef43d0a14a91e96 100644
--- a/third_party/jinja2/_markupsafe/_native.py
+++ b/third_party/markupsafe/_native.py
@@ -8,7 +8,8 @@
     :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):
@@ -18,7 +19,7 @@ def escape(s):
     """
     if hasattr(s, '__html__'):
         return s.__html__()
-    return Markup(unicode(s)
+    return Markup(text_type(s)
         .replace('&', '&')
         .replace('>', '>')
         .replace('<', '&lt;')
@@ -40,6 +41,6 @@ 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