gnu: Add r-data.table. * gnu/packages/statistics.scm (r-data.table): New variable.
gnu: Add r-chron. * gnu/packages/statistics.scm (r-chron): New variable.
Merge branch 'master' into core-updates
gnu: r-scales: Update to 0.3.0. * gnu/packages/statistics.scm (r-scales): Update to 0.3.0.
gnu: r-scales: Update to 0.3.0. * gnu/packages/statistics.scm (r-scales): Update to 0.3.0.
gnu: Add r-dplyr. * gnu/packages/statistics.scm (r-dplyr): New variable.
gnu: Add r-r6. * gnu/packages/statistics.scm (r-r6): New variable.
gnu: Add r-testthat. * gnu/packages/statistics.scm (r-testthat): New variable.
gnu: Add r-crayon. * gnu/packages/statistics.scm (r-crayon): New variable.
gnu: Add r-memoise. * gnu/packages/statistics.scm (r-memoise): New variable.
gnu: Add r-pryr. * gnu/packages/statistics.scm (r-pryr): New variable.
gnu: Add r-codetools. * gnu/packages/statistics.scm (r-codetools): New variable.
gnu: Add r-microbenchmark. * gnu/packages/statistics.scm (r-microbenchmark): New variable.
gnu: Add r-knitr. * gnu/packages/statistics.scm (r-knitr): New variable.
gnu: Add r-yaml. * gnu/packages/statistics.scm (r-yaml): New variable.
gnu: Add r-markdown. * gnu/packages/statistics.scm (r-markdown): New variable.
gnu: Add r-mime. * gnu/packages/statistics.scm (r-mime): New variable.
gnu: Add r-highr. * gnu/packages/statistics.scm (r-highr): New variable.
gnu: Add r-formatr. * gnu/packages/statistics.scm (r-formatr): New variable.
gnu: Add r-evaluate. * gnu/packages/statistics.scm (r-evaluate): New variable.