MimeMagic: Recognise font files

MimeMagic: Recognise font files

Supported by http://blog.symbolset.com/properly-serve-webfonts
> WOFF	application/x-font-woff
> TTF	application/x-font-ttf
> EOT	application/vnd.ms-fontobject

Default nginx registry only contains EOT:
https://github.com/wikimedia/operations-debs-nginx/blob/be600c8b/debian/conf/mime.types
> application/octet-stream              eot;

Wikimedia config for Apache:
https://github.com/wikimedia/operations-puppet/blob/812f280/modules/mediawiki/files/apache/modules/mime.conf#L53-L57
> AddType application/font-woff .woff
> AddType application/font-woff2 .woff2
> AddType application/vnd.ms-fontobject .eot
> AddType application/x-font-ttf .ttf

Without these changes, wmfstatic is unable to serve UniversalLanguageSelector
TFF, EOT, and WOFF font files (currently responds with HTTP 400 error).

Example urls:

* Content-Type: application/font-woff
  https://en.wikipedia.org/static/current/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.woff
  https://en.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.woff

* Content-Type: application/x-font-ttf
  https://en.wikipedia.org/static/current/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.ttf
  https://en.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.ttf

* Content-Type: application/vnd.ms-fontobject
  https://en.wikipedia.org/static/current/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.eot
  https://en.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/amiri/amiri-bold.eot

Change-Id: Iec9459c9217cc0b09517e279189b4b36f0cd1f74