Add and configure latest z-push

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Add zpush_timezone setting for testing vars

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Update README to include information about Z-Push.

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Add tests for zpush
Remove zpush usage from README in favour of Usage wiki page.
Set log watch to weekly per http://primozverdnik.com/2011/05/logwatch-once-a-week-is-enough/
Also mailing to root (which gets forwarded to admin_email) for easier automated sorting
force "Content-Disposition: inline" for owncloud files, so that browsers will display images inline instead of trying to download them.
add public-facing directory for a gifs folder in the main user's owncloud directory
Remove postfix and apache roles from fail2ban.

I removed the postifx role because it doesn't help with spam (it blocks messages that would just be bounced anyways), and has prevented me from receiving legitimate email in the past (e.g. from a friend sitting next to me who uses gmail, from my grandmother, etc...).

I'm not sure about removing the apache role. I removed because I'm worried that a legitimate user might (e.g. me, the googlebot) be banned during debugging or because I misconfigured something.
send emails from fail2ban@ to a fail2ban mailbox
make the selfoss cronjob not clobber the owncloud cron job, and redirect the output to /dev/null so we don't get email about it