BF: this addresses #632
BF: this addresses #632

pysal/pysal,jlaura/pysal,hasecbinusr/pysal,sjsrey/pysal_core,pedrovma/pysal,weikang9009/pysal,lanselin/pysal,ljwolf/pysal_core,schmidtc/pysal,ljwolf/pysal,TaylorOshan/pysal,nathania/pysal,sjsrey/pysal,chhao91/pysal,TaylorOshan/pysal,jlaura/pysal,pastephens/pysal,ljwolf/pysal_core,ljwolf/pysal,ljwolf/pysal_core,pastephens/pysal,pastephens/pysal,sjsrey/pysal_core,nathania/pysal,hasecbinusr/pysal,badjr/pysal,chhao91/pysal,badjr/pysal,ljwolf/pysal,TaylorOshan/pysal,lixun910/pysal,lixun910/pysal,schmidtc/pysal,hasecbinusr/pysal,jlaura/pysal,sjsrey/pysal_core,lixun910/pysal