Port UserRepository and remove OW stuff

Geekbot.net/Database/Models/KarmaModel.cs

@@ -1,7 +1,21 @@
-namespace Geekbot.net.Database.Models
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Geekbot.net.Database.Models
 {
     public class KarmaModel
     {
+        [Key]
+        public int Id { get; set; }
         
+        [Required]
+        public long GuildId { get; set; }
+        
+        [Required]
+        public long UserId { get; set; }
+        
+        public int Karma { get; set; }
+        
+        public DateTimeOffset TimeOut { get; set; }
     }
 }