Massive update to reflect the current state of the original Ruby forgery

[pilosus]

CHANGELOG

• Python 3 compatibility bug fixed (xrange put in the try/except clauses, so that it can be fallback to the range in python3)
• Some new methods added to the modules already existed, so that now they match the modules in the original Ruby repo.
• New modules added: credit_card, email, geo, russian_tax, time
• New modules covered with unit-test