Add separate container instructions

Fixes #34
Fixes #5
Fix command line usage
Update README.md

Fix typo
Merge pull request #43 from mrmayfield/patch-1

Update README.md
Inline /etc/nginx/proxy_params

/etc/nginx/proxy_params does not exist in the official nginx image.
Pass through X-Forwarded-Proto

* Creates a $proxy_x_forwarded_proto variable that is set to the
  X-Forwarded-Proto header passed by the client or else the $scheme