* Add #394: Postfix Virtual Transport
This makes it possible to specify a lmtp config file, by providing
POSTFIX_DAGENT.
Update - Readme with informations about #394
* Add Variable ENABLE_POSTFIX_VIRTUAL_TRANSPORT (task)
* Add Variable POSTFIX_DAGENT (section)
Added Unit tests for virtual transport
* Fix syntax error in test/tests.bats
* Fix Unit Test
