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
Merge pull request #41 from synctree/pass-through-x-forwarded-proto

Pass through X-Forwarded-Proto
Update to docker-gen 0.3.4
Merge pull request #44 from synctree/docker-gen-0.3.4

Update to docker-gen 0.3.4
Add comment about X-Forwarded-Proto mapping
Set "Connection: upgrade" when we receive an "Upgrade" header

Fixes #37
Merge pull request #46 from md5/connection-upgrade

Send "Connection: upgrade" when "Upgrade" header is received
Merge remote-tracking branch 'upstream/master'