Fixed Issue #21: TrackableEntities.tt From EDMX and Complex Type.

Updated EDMX client T4 template in WebApiSample.ModelFirst to derive complex types from ModelBase; added client code to manually mark complex type as Modified and update parent entity.

Updated CSharpDbContext.Types.tt to support complex types; added T4 template to VS2012 and VS2013 Deploy projects. Also incremented Deploy projects to v 2.5 and added release notes file.