Modified how attachments are pushed to the API.

Added support for BMP and GIF image types.

PWAPPv2/Source/DataObjects/PWFile.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PWAPPv2.Source.DataObjects
+{
+    interface PWFile
+    {
+        List<Attachments.PWFileUpload> GetFileUploads(string attToken, string ContentId);
+    }
+}