gae: add some libs we need

Issue #300 resolved
Reimar Bauer
created an issue tells that we have to add some stuff in its log output:

markupsafe (jinja2 tries to import this, but can fall back to builtin stuff) PIL (is binary stuff moin optionally uses)

--- a/app.yaml  Fri Nov 16 07:49:25 2012 +0100
+++ b/app.yaml  Sat Dec 01 09:47:18 2012 +0100
@@ -52,3 +52,8 @@
 # We must include jinja2 in the support directory, so we can use the same
 # support tgz for both GAE and standalone local installations (both do not use
 # Thus, we do not use the jinja2 GAE could provide.
+- name: markupsafe                                                              
+  version: latest