fixed typo in test_network.py
fixed typo in test_network.py

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