Added the MetaPrograming related files

Added the Interpreter related ruby files.

Added the Builder pattern related code

Added the Factory pattern files

Removed text file

Added the Decorator pattern

Added the Proxy pattern related files

Added the Adapter pattern related files

Added the employee example with Madeleine storage

Added the new classes for the Command pattern

Added the Account and Portfolio classes to demo Enumerable

Started working on the Iterator pattern

Added the total_number_basic_task method to cound the number of simple tasks

Added the parent attribute to the task and new rspec test for the CompositeTask

Fixed the code to use the << operator