Properly check for broken hash tags out on the web
Add special exception for GitHub tags

Not too pleased I need to do this.
Truncate this message for Travis
Don't worry about broken hashes on 4xx calls
Setup GitHub hash check separately
Rely on URI.fragment to get hash info
Merge pull request #100 from gjtorikian/fix-head-request-checks-with-hashtag

Fix head request checks with hashtag