Thanks-to: 8e693b3db3

Conflicts:
	roles/common/tasks/main.yml

I ran a check on http://mail-tester.com and found out I was missing a header to be set for DMARC. SInce I missed it, maybe someone else missed it as well, so maybe it could go into the README.

Z-push apache config: Jessie also uses conf-available/conf-enabled

This reverts commit 6b53da4bdc.

Using a different approach to maintain wheezy compatibility

Jessie

Not awesome. We need a better alternative, ideally one with a better security stance.

Formatting the task names.

Use newer native "write HTTP" plugin to send metrics to Librato, if configured.

Move Apache task to their own file.

# Conflicts:
#	README.md
#	Vagrantfile
#	roles/mailserver/tasks/dovecot.yml

Fix typo in tarsnap.yml

Resolves #388.

Resolves #400.

Resolves #402.

Resolves #410.