Extends the module object with module and instance accessors for class attributes, just like the native attr* accessors for instance attributes. 

 module AppConfiguration mattr_accessor :google_api_key self.google_api_key = "123456789" mattr_accessor :paypal_url self.paypal_url = "www.sandbox.paypal.com" end AppConfiguration.google_api_key = "overriding the api key!"
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