= nbp == DESCRIPTION: Return the course in polish zl for given currency for given date The date should be from range 2002-01-02 up today. == FEATURES/PROBLEMS: If there's no currency for valid date , the program search the closest date by decreasing given date, example : 2009-01-10 (Saturday - no currency), the system return values from 2009-01-09 == SYNOPSIS: avaliable - return list of avaliable currency with their shortcuts Bank.money("year-month-day","currency_shortcut") - where year-month-day should be from range (2002-01-02 up today) examples: 1. money("2007-10-09","USD") => "dolar ameryka\361ski,kurs sredni:2,6750" 2. money("2006-12-30","EUR") There's no value for valid date - searching closest => "euro,kurs sredni:3,8312"