protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingEntitySetNameConvention>();
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
modelBuilder.Entity<User>().HasMany(r => r.Roles);
modelBuilder.Entity<Role>().HasMany(u => u.Users);
base.OnModelCreating(modelBuilder);
}