test config: added SITE_NAME and MAIL_SENDER
* abilian/services/auth/views.py: fix query filter

bug introduced in 2e3a24e26771787dd77a65b7776555056638a5b3
* abilian/services/auth/views.py: exempt csrf for forgotten_pw and reset_pw
auth views: use full blueprint name in url_for(), in order to be able to call view functions from other views