Placeholder for Event payload issues to support making PUSH/PULL operations consistent

This is a placeholder for a number of issues that will need to be addressed within EI to support some payload issues being debated within the OpenADR Alliance. The key is that the Alliance is trying to make the PUSH and PULL scenarios more consistent and to to this may require some changes to the existing payloads. The Alliance will not require that EI wait for the Alliance to come to full agreement on all the issues, but there will be some changes submitted that will allow the Alliance to pursue a couple of different options.