update credits
update credits

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