added support for cross-references
added support for cross-references

mhils/pycco,ryanroser/pycco,williamwallacebrave/pycco,kingcons/pycco,lincolnloop/pycco,gobengo/pycco,mdornseif/pycco,ChadFulton/pycco,sprin/pycco,gorakhargosh/pycco,ryanisnan/pycco,rgeoghegan/pycco,rahuldave/pycco,raylu/pycco,theerik/pycco,hoffmanc/pycco,fitzgen/pycco,akaihola/pycco,edwelker/pycco,pearswj/pycco