Moved to a cleaner configuration system

I made a small little YAML based configuration system for the site. It's a centralized file, ignored in commits, for all the secrets and user-personal stuff that shouldn't go back into a commit like customized redis settings. 

I also updated the readme to reflect this. To get an understanding of what's going on, look at the application_example.yml and then secret_token.rb and one of the environment files, specifically the redis config section. 

Of course you don't need to accept this PR, I just think it's a great thing to have. Makes life much easier.