Added config stup
Retrieve configuration from yaml file or hash
Naming convention as of https://github.com/bbatsov/ruby-style-guide#naming
Throw exception if config key not exists
Do not distinguish symbol from string keys

- Side effect is a clone of a hash, preventing manipulation :)
Raise error if config source is invalid
Return whole config hash on #get('::')
Added expectations for Array and Hash values
Added fallback parameter for Config#get()
Deep symbolize all keys of config hash

- Added gem 'rails/activesupport'
Added missing license information
Fixed annotations
Extended core class Array by #has_key?()
Find nested values using namespace separators
Finish config