CustomInfo support in Digest Class
rails 2 backward compatibility, custom info module and tests
added an Iframe class just to handle the urls of the production and test environments
added an Iframe class just to handle the urls of the production and test environments - refactored to a class method
iframe can be required from top
Merge pull request #1 from dSmart-srl/master

Custom info (+test), compatibilità con rails 2, supporto per iframe