short_open_tag=Off was mistakenly left in the earlier merge (was a fix for my old autodiscover.php but not needed with z-push), also regrouping the nginx directive to be near the rest of Z-Push

z-push autodiscover should use the primary hostname for the mail server and not the domain part of the email address (both may work, but the primary hostname is more likely to have a signed SSL cert)

* zen.spamhaus.org
* dbl.spamhaus.org
* checks if a connection to Google's MTA on port 25 works

broken in 04454b35

fixes #143

closes #19

whats_next: when there are multiple responses like for NS records sort the responses so we can compare to a fixed order

Merges branch 'owncloud' of github.com:jkaberg/mailinabox
which is pull request #135, closes #135

thanks @jkaberg, @fmbiete, @owncloud

based on a script by @jkaberg in #141

owncloud will only let users access it from the PRIMARY_HOSTNAME (due to its trusted_domains option being set statically), so only include /cloud in the nginx configuration for PRIMARY_HOSTNAME

/cloud/index.php/apps/files/ajax/scan.php would not be parsed right because of two .php's

This lets downloads from the file app work.

owncloud: automatically set it up with an administrator account that even the box owner doesn't have access to, because we do not want to have the user hit ownCloud's setup page on first visit

owncloud: set forcessl to be true to get the corret HSTS header (would be better if we could prevent ownCloud from sending one)

when modifying php.ini, use ; as the comment char not # because php emits horrid deprecation warnings otherwise