Varnish

Nginx on this vagrant box only have a 10ms faster loadtime in overall compared to apache.
But using Varnish to http cache requests, we're talking 12ms loadtime where nginx use 1.32s.

This pull requests sets up the vagrant box to install and configure varnish on port 6081 for testing, using nginx as backend.

it also adds an experimental script that creates .gz assets of css, js, svg and font assets in order to have nginx load those instead of compressing the output on the fly, to save additional cpu cycles and speed up loadtime without increasing file sizes.