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.
use assertEqual instead of assertTrue)
Update to Python 2.7.5
buildout: removed option environment-vars, this option is not supported by buildout >= 2
Fix pep8 test by just searching just below src/adhocracy
Fix badge tests after shibboleth changes (fixes #395)
Merge branch 'develop' of github.com:liqd/adhocracy into develop
Fix: thumbnail tests are broken #377
make sure buildout does not build Pillow, the python build takes care for this dependency
Use ; instead of , for Shibboleth multi value fields

This corresponds to what mod_shibboleth does.
Update lxml from 3.0.2 to 3.2.1
Fix postgresql-initdb buildout part
Fix OpenID login (#416)
OpenID selector: Clean up
Move OpenID selector stylesheet into main stylesheet pipeline
[openid selector] move JS into main pipeline as well
Delete unused files
Fix OpenID input field name
Merge pull request #434 from phihag/fix-openid-login

Fix OpenID login (#416)
Fix htmlfill when multiple forms are present

Currently, htmlfilll always picks the first form it can find in the HTML code, and that is usually the inline form.
Instead, we should render just the login tile, pass it to htmlfill, and then paste it into the rest of the template.
Fixes #423.