Help with "unknown directive"

Hi, i'm Claudio,
i have some problem with nginx on a raspberry pi, i have installed the version 1.4.5,
after installation, had lunched and it works good, but now when i modify the nginx.conf in /etc/nginx have ever th problem with an "unknown directive"

here is mine nginx.conf
https://gist.github.com/traverso85/9156732

where i do wrong? someone can help me?

Thanks Claudio