Removed some dead code on the interfaces. Introduced UnitOfWork to simplify repo injection.

API/Entities/Series.cs

@@ -30,10 +30,8 @@ namespace API.Entities
         /// Sum of all Volume pages
         /// </summary>
         public int Pages { get; set; }
-        /// <summary>
-        /// Total Volumes linked to Entity
-        /// </summary>
-        //public int TotalVolumes { get; set; }
+        
+        // Relationships
         public ICollection<Volume> Volumes { get; set; }
         public Library Library { get; set; }
         public int LibraryId { get; set; }