no notifications for own arguments
removed lighttpd conf, added nginx rewrite rules
removed rewrite rules unused in beoportal0
only upvotes for questions, just show vote state on main page

* questions can only be upvoted (& revoked)
* voting for questions is no longer possible on main page
    * shows just the current vote state
* special german translations for BEO portal ('Anträge unterstützen')
fixed argument stats error when all votes are removed from DB

* stats update did not happen if all users revoked their argument vote
* correct updateArgumentScore() method, which avoid this error was present, but never used
removed faction constraints on voting
add memberId to user table on signup (with token)

* a signup token is associated with one memberId
fixed css classes for argument view

* question_* -> argument_*