Merge branch 'release/0.3.9'
Add jekyll doctor command

Fixes #29
Add Grunt as a peer dependency, limit to grunt 0.4.x
Add Rob Wierzbowski as a contributor :D
Remove spaces in version specifications, update tmp
Remove fallback for non-options object configuration

We've already gone through a minor version since the config options object
was added. Should do another minor version bump just in case.
Merge branch 'master' into develop

Conflicts:
	package.json