NGINX: cranking up client_max_body_size to 800MB

default client_max_body_size is 1MB and if not increased, will result in HTTP error 413 - http://en.wikipedia.org/wiki/HTTP_413#4xx_Client_Error
CONTRIB: Debian INIT script
DEBIAN Init: added root check, author and fixes for reload/restart
Merge pull request #74 from anapsix/debian-init

Debian INIT and NGINX update