Change Signature for Extensions in Entity Helper in order to reduce syntax

[hherzl]

Change Signature for Extensions in Entity Helper in order to reduce syntax.

var student = db
	.DefineEntity(new
	{
		Id = 0,
		GivenName = "",
		MiddleName = "",
		FamilyName = "",
		Gender = ""
	})
	.SetNaming("Student")
	.SetColumnFor(e => e.GivenName, 15)
	.SetColumnFor(e => e.MiddleName, 15, true)
	.SetColumnFor(e => e.FamilyName, 15)
	.SetColumnFor(e => e.Gender, 1)
	.SetIdentity(e => e.Id)
	.SetPrimaryKey(e => e.Id)
	;