hadley/devtools — pull request #206 by wch (2012-12-11 20:14:16+00:00)
Title: Make CRAN version check optional

This also switches from using `--as-cran` to setting some environment variables. This is because `--as-cran` appears to override `_R_CHECK_CRAN_INCOMING_=TRUE`.

Note that this pull request is based off of the use-check-function branch; only the last commit in the series is unique to this branch.