nginx htpasswd naming, nginx CORS support and gunicorn problem

Hi, 
I's confused when I saw a few conventions of passing nginx_htpasswd parameter - it was like htpasswd in one place, htpassword in another, so I decided to do a little cleaning.
Second thing - there're missing semicolons after headers for CORS support.
Lastly I changed working_dir for gunicorn, because gunicorn couldn't find it and was restarting workers all the time. Of course it wasn't working at that time ;)

Hope I'm not wrong. If so, I apologize. ;)