remember key updates:

- use a purely random key
- regenerate a new key each time a user signs in via remember cookie
- delete remember key on sign out
invalid all remember keys if user changes its password
user is asked to enter current password for editing private data

This is because this data is sensitive (contact email, new password, ...)
We so prevent illegitimate user who would have hijacked cookies for causing too much damage
log bad remember cookie in statsd
retrieve ip when haproxy/varnish present
use jquery/cors polyfill for ie8 and ie9

todo: make this available verywhere, and not just when loading
meta outings on homepage
mobile version quote shorthand

when both 'quote selected text' and 'reply by quoting' are present,
use only one button, and use full quote if selected text is empty
Merge branch 'remember-cookie'
i18n