Update jinja2 to master (between 2.8 and 2.8.1); fix urlencode bug.

appengine/components/components/utils.py

Index: appengine/components/components/utils.py
diff --git a/appengine/components/components/utils.py b/appengine/components/components/utils.py
index 44cf84539b39d85ece0551f84907a9dab7d43598..4bc6d6fdc6293d31680b0bdc68c3fbdf941d95be 100644
--- a/appengine/components/components/utils.py
+++ b/appengine/components/components/utils.py
@@ -598,3 +598,11 @@ def fix_protobuf_package():
   protobuf_pkg = os.path.join(THIS_DIR, 'third_party', 'protobuf', 'google')
   if protobuf_pkg not in google.__path__:
     google.__path__.append(protobuf_pkg)
+
+
+def import_jinja2():
+  """Remove any existing jinja2 package and add ours."""
+  for i in sys.path[:]:
+    if os.path.basename(i) == 'jinja2':
+      sys.path.remove(i)
+  sys.path.append(os.path.join(THIS_DIR, 'third_party'))