don't let sphinx save the environment
don't let sphinx save the environment

fixes an issue where a python code error (a module couldn't be imported)
broke future `setup.py doc` invocations until you removed all .pyc files

ameily/mongo-python-driver,brianwrf/mongo-python-driver,jbenet/mongo-python-driver,mher/pymongo,ultrabug/mongo-python-driver,jbenet/mongo-python-driver,pigate/mongo-python-driver,jameslittle/mongo-python-driver,mongodb/mongo-python-driver,rychipman/mongo-python-driver,inspectlabs/mongo-python-driver,jbenet/mongo-python-driver,aherlihy/mongo-python-driver,brianwrf/mongo-python-driver,ShaneHarvey/mongo-python-driver,rychipman/mongo-python-driver,ramnes/mongo-python-driver,WingGao/mongo-python-driver,ShaneHarvey/mongo-python-driver,ultrabug/mongo-python-driver,felixonmars/mongo-python-driver,pigate/mongo-python-driver,llvtt/mongo-python-driver,ShaneHarvey/mongo-python-driver,mongodb/mongo-python-driver,ameily/mongo-python-driver,aherlihy/mongo-python-driver,develf/mongo-python-driver,gormanb/mongo-python-driver,mher/pymongo,bq-xiao/mongo-python-driver,marcosleonefilho/hoop-pymongo,marcosleonefilho/hoop-pymongo,mongodb/mongo-python-driver,develf/mongo-python-driver,macdiesel/mongo-python-driver,jameslittle/mongo-python-driver,inspectlabs/mongo-python-driver,WingGao/mongo-python-driver,felixonmars/mongo-python-driver,ramnes/mongo-python-driver,bq-xiao/mongo-python-driver,gormanb/mongo-python-driver,llvtt/mongo-python-driver,aherlihy/mongo-python-driver,ramnes/mongo-python-driver,macdiesel/mongo-python-driver,marcosleonefilho/hoop-pymongo