Install nginx and add sane config

[taoeffect]

Requirements:

• All traces of Apache server must be obliterated (see also Get rid of z-push, owncloud, google auth (?), and other unused items. #6)
• Must not destroy or overwrite existing nginx installations / configurations
• Must be secure (see bettercrypto and mozilla's thing)
• Nginx config must NOT enable HSTS.
• Primarily used for the purpose of Mailpile (Add Mailpile #3) without stepping on the toes of other sites on the server.
• Install from backports (depends on Fix backports pinning. #7).

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[taoeffect]

We should install from their repo as per: http://wiki.nginx.org/Install (make sure to use wheezy instead of squeeze and grab their GPG key).

[bgw]

Related to this: https://github.com/h5bp/server-configs-nginx

[taoeffect]

Nice link. 👍