Getting closer to fully PHP5 OO. Code converted from PERL style
to real PHP.

* Functional Changes
    * HTTPBase is now an abstract class.
    * Added public __get and __set to HTTPBase.
    * Converted values of 0 and 1 to true and false where
      applicable.
    * API_VERSION is now a class constant of
      CreditCardFraudDetection and accessed by HTTPBase via
      static::API_VERSION.

* Non-functional Changes
    * Code formatting cleaned up to follow Zend Framework's coding
      standard (http://framework.zend.com/manual/1.12/en/coding-standard.html).
    * A lot of comments cleaned up to remove PERL terminology.
      i.e. hash vs array