Updated Song model to include ArtistId, Updated Artist Model, and partially implemented Artist API endpoint functionality. I left TODO's on where to pick up. #19, #21, #26

Models/Artist.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 using Newtonsoft.Json;
 
@@ -7,10 +8,13 @@ namespace Icarus.Models
 	public class Artist
 	{
 		[JsonProperty("id")]
-		public int Id { get; set; }
+		public int ArtistId { get; set; }
 		[JsonProperty("name")]
 		public string Name { get; set; }
 		[JsonProperty("song_count")]
 		public int SongCount { get; set; }
+
+		[JsonIgnore]
+		public List<Song> Songs { get; set; }
 	}
 }