Manually merge #418: github PATs.
Closes #418
Update README.md

Fix a missing space after a period. Consistently markup `devtools` as per the rest of the document.
Merge pull request #440 from gavinsimpson/patch-1

Update README.md
Merge branch 'master' of https://github.com/kevinushey/devtools into kevinushey-master
Fix markdown bug
Merge pull request #441 from imanuelcostigan/patch-1

Fix markdown bug
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
import methods::setPackageName so test can be run easily with Rscript
Pass on auth_token. Closes #442
Merge pull request #444 from jlburkhead/master

import methods::setPackageName so test can be run easily with Rscript
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.