Fix for issue #81
Merge pull request #83 from svanharmelen/fix-issue-81

Fix for issue #81
updating CHANGELOG and bumping metadata
adding the usage of virtual_domains along with other file types other than hash
moving db_type to be set in the generic attributes
adding a guard around virtual_alias_maps and virtual_alias_domains. this way you can toggle which config option you want added into main.cf.
moving virtual domain usage into a use_virtual_aliases_domains block to mimic use_virtual_aliases
fixing typo for alias_db location in omnios