Add example environment settings

An environment file was required, but no examples or documentation
existed to that effect.
Ignore node_modules from source control
Improve installation and usage README instructions
Extract copied link domain into env variable

Including protocol in case you, like me, enjoy SSL.
Add AWS example vars and respective README note
Specify region

So we don't have to guess what it defaults to
Actually throw errors for uploads
Add NGINX reverse-proxy example to README
Add KeyRemap4Macbook section to README
Merge pull request #1 from alexblackie/master

Productionify