v3 of DOIT_SOA_ORDER_IFACE_L includes two new parameters,
`P_UNIT_PROMO_PRICE` and `P_PROMO_DISCOUNT_NAME` for specifying
promotional discounts.

Updated the WSDL class generator script to support any WSDL and output location. Added a logger to show what Wsdl2Php generator is doing.

Removed ProductServiceSoapClientIT#testCreateProduct because we already test creation when attempting to update a product.

Fixed the integration-test Phing target to actually run integration tests. Rearranged target dependences to avoid excessive composer installs.

Updated PHPUnit

Moved the converstion from Money to float logic into a private method.  Removed the check for an integer from Money#getAmount, since I trust the library to honor its contract (and returning floats would defeat the purpose of it.)  Added verification that we are working in USD.

Added additional fields in the Product class to support Point-of-Sale. Enforced stricter types rather than everything being a string, especially with Product#cost, which uses the Money library for PHP. Removed Product#description because the endpoint does not support a long description of the product.

Introduced a Phing build configuration to help with the automatic building and testing of the client, as well as the release process.

In composer.json: cleaned up requirements, added a version, and provided an actual namespace for "psr-4" (composer warns against an empty namespace declaration). Commited composer.lock file to repository.

Cleaned up README documentation for obtaining the client via Composer. Removed section about manual install, as this client requires the autoloading capabilities of Composer. Added release documentation.

Renamed cbsIntegrationTest to cbsTechstoreClientIT so that PHPUnit does not pick up on it when running unit tests.

Cleaned up .gitignore file and deleted reports/phpunit.xml, as it should not have been commited to the repository.