Feature/add variable type registry

[imdrasil]

• allow registering custom types
• add ENVied.[] which avoids #method_missing invocation; it raises ArgumentError if given variable is not defined

[johncarney]

Interresting. I didn't know you could downcase a symbol 👍

[johncarney]

I think there is a much simpler way to achieve custom types. Leave ENVied::Coercer as-is and add this to ENVied::Configuration:

def type(name, &block)
  coercer.supported_types.push(name.to_sym).uniq!.sort!
  coercer.define_singleton_method("to_#{name}", &block)
end

Or, if coercer is not persistent, you can define the method on the class.

def type(name, &block)
  coercer.supported_types.push(name.to_sym).uniq!.sort!
  coercer.class.define_method("to_#{name}", &block)
end

[imdrasil]

@johncarney nice idea. But I still have to use separate containers for the default types and custom. The reason is that default types use ENVied::Coercer::ENViedString methods and custom ones - ENVied::Coercer

[johncarney]

Ok. I'll take your word for it :)

[dangalipo]

10/10 GREATEST COMMIT EVER