fix invalid html: missing closing div in templates/template_doc.html
bump buildout recipe versions
Bump redis and redis and memcached python libraries
Bump misc python packages

Minor updates of MarkupSafe, ipython, pyflakes
Rename static page template

from template_doc.html to static/show.html where it is expected.
Show content from static index page on start page if available
Do not fail if static index page isn't available
Make post register/login urls configurable (fixes #431)

This allows to define post register/login urls and instances, which a
user is redirected to after succesful register/login, if no came_from
parameter is set.

If these options aren't set, the user is redirected to the dashboard
instead.