'Public Domain' is not the name of a license; the Unlicense should at the least be called 'Public Domain Dedication', and the permalink should be called 'unlicense' to distinguish it from other methods of making a public domain dedication
add cc0 license
rewrap to 78 characters, per #126 and #74
Merge pull request #126 from JoshData/cc0

Add CC0 as a license
Merge pull request #125 from JoshData/rename-public-domain

"Public Domain" is not the name of a license, the title of "Unlicense" should be something else