Adds MIME type mappings from the mimetype module as fallback rules when
no other rule can be matched. Also attempts to slightly humanize MIME
types by removing x- from types.
Coverage increased (+0.1%) to 96.629% when pulling 781498747209d5b11c264cb1c05bc7568a393ec2 on sseemayer:master into 57d9c775711fa8a91b75b022c295441207c76f22 on chriscz:master.
Ref #9
Adds MIME type mappings from the mimetype module as fallback rules when no other rule can be matched. Also attempts to slightly humanize MIME types by removing x- from types.