Modified how attachments are pushed to the API.

Added support for BMP and GIF image types.

PWAPPv2/Source/Attachments/PWBaseAttachment.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PWAPPv2.Source.Attachments
+{
+    public class PWBaseAttachment
+    {
+        public string AttToken { get; set; }
+        public string FileName { get; set; }
+        public bool ThumbExists { get; set; }
+        public bool ZoomExists { get; set; }
+        public string FileDate { get; set; }
+        public string FileType { get; set; }
+
+    }
+}