* Restructure add_server_directives to take a vhost as argument. This is the first step towards fixing vhost selection in nginx.
* Save path to vhost in file while parsing in get_vhosts().
* Disable creating a new server block when no names match.
* Make parser select vhost based on information in the vhost it found previously, rather than searching again for a match.
* Make add_server_directives update the passed vhost
* Update boulder config to pass test
* Add testing code for the _do_for_subarray function
* documentation and formatting updates
