Fixed and rewritten draw using new API, others coming

I broke it when preparing for Github publishing

NadekoBot/Classes/Cards.cs

@@ -47,7 +47,7 @@ public class Cards
                 {
                     str += GetName().ToLower();
                 }
-                return @"images/cards/" + str + "_of_" + suit.ToString().ToLower() + ".jpg";
+                return @"./images/cards/" + str + "_of_" + suit.ToString().ToLower() + ".jpg";
             }
         }
 

NadekoBot/Classes/ImageHandler.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -35,5 +37,12 @@ namespace NadekoBot
             }
             return bitmap;
         }
+
+        public static Stream ImageToStream(Image img,ImageFormat format) {
+            MemoryStream stream = new MemoryStream();
+            img.Save(stream, format);
+            stream.Position = 0;
+            return stream;
+        }
     }
 }