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