Upgrade RStudio to 0.99.485: fix Safari 9 bug
Upgrade RStudio to 0.99.485: fix Safari 9 bug

There's a bug introduced with the change to Safari 9 and/or
El Capitan where RStudio crashes when changing project.

For reference, the specific issue is rstudio/rstudio#505.

kuno/homebrew-cask,kuno/homebrew-cask