Optimize nginx defualt config file
Update mime.types file
Add base vhost configuration

This file is meant to be included in every vhost and includes sane
or appropriate defaults for several site details
Add X-UA header

We can now savely remove the Chrome Frame metat tag from all static
sites and simply rely on nginx to deal with the inclusion
Use sensible defaults as vhost base

Credit: mostly copied from html5boilerplate project