Use H5BP server configs

This has been tested locally but I would like to try to deploy it on digital ocean to see if it runs alright on a remote server (shouldn't be an issue)

Any feedback on this?

* * *

Checks out a stable version of h5bp/server-configs-nginx and applies it
to the /etc/nginx folder

http://goo.gl/pBfB4W

Misc:
Adds "restart nginx" handler

closes https://github.com/roots/bedrock-ansible/issues/31
This bit strips off `www` so it is doing what you are describing. 

Let's get more opinions on this being included by default. For my purposes (and most people who just want to follow the readme instructions and be done with it) This functionality is going to be used pretty much every time. I will go ahead and add a toggle though.