use either /usr/bin/open or /usr/bin/xdg-open for sending e-mail when RStudio is active
extract function email_browser, use Sys.which
use early termination instead of deeply-nested if-s
Merge pull request #443 from krlmlr/email

use either /usr/bin/open or /usr/bin/xdg-open for sending e-mail when RStudio is active
Pass ncpus to install.packages.
Manual merge. Closes #401.
Update docs
Turn off check_devtools. Closes #446
Organise NEWS
Pick version number
Update check notes
Add roxygen ver dep to DESCRIPTION. Better wording in news.
Final notes
Look for github PAT in env var.
Closes #445
Update documentation
throw error on trailing slashes in GitHub paths
Merge pull request #448 from krlmlr/github-trailing-slash

throw error on trailing slashes in GitHub paths
Mask base::system.file with devtools version
Update NEWS
Mask utils::help with devtools version
Mask utils::? with devtools version