pep8 fixes for mapping.py
pep8 fixes for mapping.py

sjsrey/pysal,weikang9009/pysal,ljwolf/pysal,ljwolf/pysal,pysal/pysal,lixun910/pysal,lixun910/pysal,ljwolf/pysal,lixun910/pysal,lanselin/pysal,pedrovma/pysal