Remove HTTPBase Includes for Composer Autoload

This fixes composer integration, as previously it would attempt to require HTTPBase in twice which caused this fatal error: `Fatal error: require(): Cannot redeclare class httpbase`

This is caused by composer's "files" autoload using require instead of require_once, unless I have missed a step to set up composer correctly.  [This can be seen here.](https://github.com/composer/composer/blob/master/src/Composer/Autoload/AutoloadGenerator.php#L466)

Another solution would be to change the order of the includes in `composer.json` so `HTTPBase.php` is loaded before `CreditCardFraudDetection.php`.  However, I'm not entirely sure if the order of `autoload_files` is preserved in every case.  I've included the commit in this pull request that would accomplish this.