Parse config/config.yml with ERB

[glebm]

More flexible configuration, consistent with how Rails configuration files are parsed.

[TeatroIO]

I've prepared a stage. Click to open.

[coveralls]

Coverage remained the same when pulling a4569e2 on glebm:patch-2 into c8ad80d on errbit:master.

[stevecrozz-]

Can you explain your specific use case? I'm pretty sold on the idea of using environment variables to configure apps dynamically (ala 12-factor). Errbit supports this approach: https://github.com/errbit/errbit/blob/master/docs/ENV-VARIABLES.md

But I'd love to know if you have a situation where this isn't good enough.

[stevecrozz-]

Closing until I hear back about a specific use case that isn't covered by environment variable configuration.