added favicon image/x-icon MIME type to mime.js
added favicon image/x-icon MIME type to mime.js

edpaget/node-static,lucasconstantino/node-static,Slayer95/node-static,hayashi311/node-static,cloudhead/node-static,brodybits/node-static,winkapp/node-static,janmonschke/node-static,hayksaakian/static_striationnutrition