Add purpose editing

Web/Models/PurposeType.cs

@@ -1,12 +1,17 @@
 using System.ComponentModel.DataAnnotations;
+using System.Web.Mvc;
+using MileageTraker.Web.Attributes;
 
 namespace MileageTraker.Web.Models
 {
 	public class PurposeType
 	{
 		[Key]
+		[HiddenInput(DisplayValue = false)]
 		public int PurposeTypeId { get; set; }
+		[Required]
 		public string Purpose { get; set; }
+		[InputSize("mini")]
 		public int SortOrder { get; set; }
 	}
 }