def dependent_gems
    out = []
    Gem::Specification.each do |spec|
      spec.dependencies.each do |dep|
        if self.satisfies_requirement?(dep) then
          sats = []
          find_all_satisfiers(dep) do |sat|
            sats << sat
          end
          out << [spec, dep, sats]
        end
      end
    end
    out
  end
#
Return a list of all gems that have a dependency on this gemspec.  The
list is structured with entries that conform to:

[depending_gem, dependency, [list_of_gems_that_satisfy_dependency]]