initial commit

Successfully tested in [RStudio
0.98.1056](http://download1.rstudio.org/RStudio-0.98.1062.dmg) and [R
3.1.1 GUI 1.65 Mavericks build
(6784)](http://cran.rstudio.com/bin/macosx/R-3.1.1-mavericks.pkg) on
Mac OS X 10.9.5.