fix chronic git url in README
clean up README
added ordinal string example to README
Merge branch 'master' of https://github.com/jfelchner/chronic into jf…
Correct 404'ing project URL in the README.
Changed the repo owner (github -> mojombo) and made the URL https to save the world from redirects.
Add ordinal format support: ie 'February 14th, 2004'
Update README to Markdown.