Check for license URIs and don't link if not there
Merge branch 'refs/heads/master' into feature-http-host-improvements
Separate out file previews into partials
Hide changes title if data isn't available
Add iframe preview for HTML content
Hide sources section if empty
Add HTML preview in iframe
Add file list if there is more than one file
Update data_kitten to latest
Merge pull request #30 from theodi/feature-http-host-improvements

A few UI improvements, and a data kitten update.