Added additional common internet media types

Many of the changes come from: http://en.wikipedia.org/wiki/Internet_media_type#List_of_common_media_types

dtd as application/xml-dtd
http://tools.ietf.org/html/rfc3023#section-3.5

vcf and vcard as text/vcard				http://tools.ietf.org/html/rfc6350#section-10.1

dart as application/dart
https://www.dartlang.org/articles/embedding-in-html/

xps as application/vnd.ms-xpsdocument
oxps as application/oxps
http://www.ecma-international.org/publications/standards/Ecma-388.htm

flac as audio/x-flac
http://en.wikipedia.org/wiki/FLAC

spx as audio/ogg
http://tools.ietf.org/html/rfc5334#section-10.3

opus as audio/ogg
http://tools.ietf.org/html/draft-terriberry-oggopus-01

X3D Mime Types:
http://www.web3d.org/x3d/learn/mimetypes/
http://www.iana.org/assignments/media-types/model/x3d-vrml

appcache for text/cache-manifest
http://en.wikipedia.org/wiki/Cache_manifest_in_HTML5