Remove env fiddling from setup.py.
Remove env fiddling from setup.py.

rafapereirabr/pandana,rafapereirabr/pandana,waddell/pandana,synthicity/pandana,waddell/pandana,synthicity/pandana,UDST/pandana,rafapereirabr/pandana,synthicity/pandana,waddell/pandana,SANDAG/pandana,SANDAG/pandana,rafapereirabr/pandana,UDST/pandana,SANDAG/pandana,UDST/pandana,UDST/pandana,osPlanning/pandana,osPlanning/pandana,waddell/pandana,SANDAG/pandana,osPlanning/pandana,synthicity/pandana,osPlanning/pandana