hadley/devtools — pull request #401 by mllg (2013-12-18 12:41:01+00:00)
Title: Support direct specification of install.packages() argument Ncpus

It is a little tedious to always write:
```
with_options(list(Ncpus = 4), install(...))
with_options(list(Ncpus = 4), install_deps(...))
```
Therefore I made it an argument (as already provided by `check_cran`).