Add tab completion for upstart

Optionally include nginx.users via a pillar value

Fixes missing requisites in ng.init

If upstart is used, add symlink: /etc/init.d/nginx -> /lib/init/upstart-job

Added map file to resolve apache utils package name

Feature/misc config items

set 'daemon on;' by default

Fix errors in source.sls

fix link to formula usage instructions

Fixed minor typo in nginx.ng.config.sls

Context parameter safety fixes

Tightened up some ng requisites.

Adds NG states

Add pillar item to disable using upstart-based services