add description and author
add description and author

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