fix for issue #55
fix for issue #55


ljwolf/pysal,badjr/pysal,jlaura/pysal,ljwolf/pysal,jlaura/pysal,sjsrey/pysal_core,sjsrey/pysal_core,ljwolf/pysal_core,pedrovma/pysal,darribas/pysal,hasecbinusr/pysal,pastephens/pysal,TaylorOshan/pysal,sjsrey/pysal_core,pastephens/pysal,spreg-git/pysal,TaylorOshan/pysal,pysal/pysal,spreg-git/pysal,ljwolf/pysal_core,schmidtc/pysal,nathania/pysal,dfolch/pysal,lanselin/pysal,nathania/pysal,badjr/pysal,jlaura/pysal,lixun910/pysal,ljwolf/pysal_core,hasecbinusr/pysal,pastephens/pysal,ljwolf/pysal,darribas/pysal,sjsrey/pysal,hasecbinusr/pysal,chhao91/pysal,lixun910/pysal,schmidtc/pysal,weikang9009/pysal,lixun910/pysal,TaylorOshan/pysal,chhao91/pysal,dfolch/pysal