class Falcon::Configuration

def each(key = :authority)

@parameter key [Symbol] Filter environments that don't have this key.
Enumerate all environments that have the specified key. 
def each(key = :authority)
	return to_enum(key) unless block_given?
	
	@environments.each do |name, environment|
		environment = environment.flatten
		
		if environment.include?(key)
			yield environment
		end
	end
end