Add in Upsert/Integrate Endpoints

[MichaelJ2324]

Since this is an external Client interacting with the API, it would be nice to include the new Upsert/Integrate APIs for ease of syncing data between an external system and SugarCRM.

[MichaelJ2324]

The Integrate APIs are part of v1.0.1. Example code for usage of upsert method on SugarBean API Object, as well as all the Integrate API methods can be found in the IntegrateApi.php file in the examples folder.