adding autocorrelation utilities to the API docs
adding autocorrelation utilities to the API docs

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