Litle SDK version 8.27.1

This goes along with the matching branch of the Springboard build repo.

 - Switched to using the libraries module for a definition of the Litle SDK. It now uses that for autoloading the needed files.
 - Added an example make file, like how salesforce_soap does.
 - Added a LitleSDK class to abstract the interactions between the Litle SDK and Commerce Litle.

Abstracting out the XmlParser to the LitleSDK class. The 8.27.1 version of the SDK namespaces its classes so I decided to wrap that in the LitleSDK class instead of directly using it. The XmlParser class itself actually just wraps DomDocument methods.