Handle environment variables, especially keys.

[digitalextremist]

As was decried previously, various API keys were listed in plain text in the repository, and deployed by cloning. The environment from the past was heavily secured, which is no longer going to be the case.

Determine the best strategy to inject keys easily so the same deployment of code might be used to connect through diverse keys; especially serving multiple organizations in various processes.

[harsh183]

I pointed this out in the earlier discussion as well but I think we can make a constants.yml file or even per environment (rails style ish) and have things load from there.