[COOK-3418] - Virtual Domain Support

Signed-off-by: Sean OMeara <someara@opscode.com>
#44 - Attributes slightly messed up

Signed-off-by: Sean OMeara <someara@opscode.com>
#55 - Add support for virtual aliases

Signed-off-by: Sean OMeara <someara@opscode.com>
#57 - Fixing attributes bug in README

Signed-off-by: Sean OMeara <someara@opscode.com>
#64 - add smtp_generic maps configuration option

Signed-off-by: Sean OMeara <someara@opscode.com>
#66 - [COOK-3652] Added support for transport mappings

Signed-off-by: Sean OMeara <someara@opscode.com>
#67 -[COOK-4662] Added support for access control

Signed-off-by: Sean OMeara <someara@opscode.com>
#68 -Properly handle binding to loopback on mixed IPV4/IPV6 systems

Signed-off-by: Sean OMeara <someara@opscode.com>