doc: updating instructions for anaconda and enthought
doc: updating instructions for anaconda and enthought

sjsrey/pysal_core,pedrovma/pysal,lixun910/pysal,TaylorOshan/pysal,dfolch/pysal,weikang9009/pysal,schmidtc/pysal,pastephens/pysal,TaylorOshan/pysal,TaylorOshan/pysal,sjsrey/pysal_core,pastephens/pysal,hasecbinusr/pysal,lanselin/pysal,nathania/pysal,hasecbinusr/pysal,darribas/pysal,spreg-git/pysal,ljwolf/pysal,chhao91/pysal,ljwolf/pysal_core,sjsrey/pysal_core,darribas/pysal,jlaura/pysal,hasecbinusr/pysal,jlaura/pysal,ljwolf/pysal_core,pysal/pysal,jlaura/pysal,nathania/pysal,ljwolf/pysal,ljwolf/pysal,chhao91/pysal,badjr/pysal,lixun910/pysal,schmidtc/pysal,spreg-git/pysal,pastephens/pysal,ljwolf/pysal_core,dfolch/pysal,sjsrey/pysal,badjr/pysal,lixun910/pysal