The single note regarding installed size of ~6MB is due to the vignettes. These produce many graphical files illustrating the package's functionality. Halving the current resolution of these images (from 72 to 36 dpi) only decreases the final package size by around 200 kB - it really is the sheer number of them required, rather than their sizes.
Other than that above, this submission generates NO notes on: Linux (via Travis-ci): R-oldrel, R-release, R-devel OSX (via Travis-ci): R-oldrel R-release Windows Visual Studio 2015 x64 (via appveyor) win-builder: R-oldrelease, R-release, R-devel
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