mention sphinx in readme
mention sphinx in readme

nigelr/JavaScriptCasts,jfarver/railscasts,ryanb/railscasts,jfarver/railscasts,jfarver/railscasts,marcagas/railscasts,ryanb/railscasts,nischay13144/railscasts,nigelr/JavaScriptCasts,marcagas/railscasts,nischay13144/railscasts,marcagas/railscasts,nischay13144/railscasts