def dependency_versions(args = {}, &bl)
      versions = {}
      args = {:recursive => true, :dev_deps  => true, :versions => versions}.merge(args)
      deps.each do |dep|
        gem = Polisher::Gem.retrieve(dep.name)
        versions.merge!(gem.versions(args, &bl))
      end
      versions
    end
def dependency_versions(args = {}, &bl)
      versions = {}
      args = {:recursive => true, :dev_deps  => true, :versions => versions}.merge(args)
      deps.each do |dep|
        gem = Polisher::Gem.retrieve(dep.name)
        versions.merge!(gem.versions(args, &bl))
      end
      versions
    end
Return list of versions of dependencies of component.