Adding doc test.
Adding doc test.

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