Add MarkupSafe library to third_party (dependency for Jinja2 2.7)

third_party/markupsafe/_compat.py

Index: third_party/markupsafe/_compat.py
diff --git a/third_party/markupsafe/_compat.py b/third_party/markupsafe/_compat.py
new file mode 100644
index 0000000000000000000000000000000000000000..29e4a3dac13f28e9c1a72792ccae83a03ed193d6
--- /dev/null
+++ b/third_party/markupsafe/_compat.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+"""
+    markupsafe._compat
+    ~~~~~~~~~~~~~~~~~~
+
+    Compatibility module for different Python versions.
+
+    :copyright: (c) 2013 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+import sys
+
+PY2 = sys.version_info[0] == 2
+
+if not PY2:
+    text_type = str
+    string_types = (str,)
+    unichr = chr
+    int_types = (int,)
+else:
+    text_type = unicode
+    string_types = (str, unicode)
+    unichr = unichr
+    int_types = (int, long)