Tweaking gitignore so that it deals with multiple virtual environments
Tweaking gitignore so that it deals with multiple virtual environments

pkgw/emcee,ipashchenko/emcee,ipashchenko/emcee-x,joezuntz/emcee,johnbachman/emcee,dfm/emcee,dfm/emcee3,farr/emcee,willvousden/emcee,jellis18/emcee3,drphilmarshall/emcee,dfm/emcee,johnbachman/emcee,elkingtonmcb/emcee,willvousden/emcee,linan7788626/emcee,ga7g08/emcee