Typescript corrections after updating to 0.8.3.
Most of domain changes for supporting Activity update complete.
Working on Activity edit and delete.  Domain/Infrastructure changes.
Working on Activity edit and delete.  MVC changes.
Creating, deleting and updateing acivities almost working.
Working on getting activity data to server and comparing.
Working on various parts of Activities Edit page.
Fix Activity.ts so that it compiles (for now).