Allow rewriting sender address

This is useful when using an SMTP server as relay that only allows
a specific sender address.
Allow relaying mails to local users

This allows relaying all mails to users like root and cron to a
specific mail address.
Allow sending a test mail on configuration changes

Send a test mail to a specified address after Postfix is restared.
Clean up some whitespace
The /etc/postfix directory needs to be owned by the postfix user

Fixes #2.

There's currently a bug in Ubuntu 12.04 TLS where the /etc/postfix
directory is owned by root and postfix has an issue creating the
sasl_passwd.db when postfix_smtp_sasl_auth_enable option is enabled.
Merge pull request #3 from balanced-ops/develop

The /etc/postfix directory needs to be owned by the postfix user
Merge branch 'feature/sender_rewrite_and_others' of https://github.com/meeee/ansible-postfix into develop

Conflicts:
	tasks/install.deb.yml
Update contributors
Bump version: 1.1.1 → 2.0.0
Merge branch 'develop'