project add-dependency should accept properties

$ project set-property --name arquillian.version --value 1.0.0.CR6
Set property [arquillian.version=1.0.0.CR6]
 $ project add-dependency org.jboss.arquillian:arquillian-bom:::${arquillian.version}
***INFO*** The command [add-dependency] takes [1] unnamed argument(s), but found [2].
***INFO*** Swallowed unknown token [{] for command [add-dependency].
***INFO*** Swallowed unknown token [arquillian.version] for command [add-dependency].
***INFO*** Swallowed unknown token [}] for command [add-dependency].
***INFO*** Could not parse [org.jboss.arquillian:arquillian-bom:::$]... please try again...
 ? [[ groupId:artifactId {:version :scope :packaging} ] (of type org.jboss.forge.project.dependencies.Dependency)]: [killed]
***INFO*** Aborted.
$ project add-dependency "org.jboss.arquillian:arquillian-bom:::${arquillian.version}"
***INFO*** Could not parse [org.jboss.arquillian:arquillian-bom:::${arquillian.version}]... please try again...