Ignore members with [NotMapped] in support of IUser<int> Indentity 2.x

 Needed specifically to help with Non Id named primary key member in poco for Dapper UserStore in Identity 2.0 User records; 
 ie MyAppUser poco to extend IUser<int> has [Key] of UserId, but must have Id as well
 thus:
 
 [NotMapped]
 public int Id
 {
     get { return UserId; }
 }