Got a question in comments for configuration provider (http://disq.us/p/2hflii0):

Let say I load some environments variable using .from_env() . After that I want to add extra config variable, like some constant (string, number, datetime ...). How do you add extra constant variable to the same config? Do we have some function similar to .from_env() Ex: .from_value() ?

There is no .from_value() method right now. I think it's a good idea to add it.