clarified datasets is part of R not RStudio
first draft of third lesson in multivariable examples
updated manifest to include multivarexamples3
fixed up multivar examples3
fixed lesson examples3
Merge remote-tracking branch 'kuiper/master'
Merge branch 'master' into MVEX3
clarified lesson for mvex3
Merge remote-tracking branch 'kuiper/master'
Merge branch 'master' into MVEX3