Test environments Local MacOS 10.12.1 install, R 3.3.2 Linux 3.13.0-29-generic (travis-ci), 3.3.1 Linux 2.6.32, R 3.1.0 win-builder (R-release and R-devel) R CMD check results There were no ERRORs, WARNINGs, or NOTEs Downstream dependencies This package has no downstream dependencies on CRAN