updates to documentation
updates to documentation

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