fix glitch in documentation: only named lists are accepted for devtools.desc
Merge pull request #612 from krlmlr/devtools-desc-doc

fix glitch in documentation: only named lists are accepted for devtools.desc
Support directory traversal to find package root when loading and unloading
Update NEWS.md to reflect support for directory traversal to find package root
Use after_failure not on_failure

Travis documentation wants the key after_failure not on_failure:
http://docs.travis-ci.com/user/build-configuration/

This key has been updated at craigcitro/r-travis:
https://github.com/craigcitro/r-travis/blob/master/sample.travis.yml
Merge pull request #617 from lmullen/update-travis-template

Use after_failure not on_failure
Typo fix
Typo fix
Typo fix
Typo fix
Typo fix
Typo fix
Typo fix
Typo fix
Merge pull request #620 from bpbond/master

Fix documentation typos
check that path is character in package_root
Use is_root helper per @hadley
Test package loading
Use is_root helper in recursive traversal as well
revdep_check: return results invisibly