Pdf Import Rewrite

Pdf Import rewritten to greatly improve QR Code detection, reduce
reliance on iTextSharp and improve thumbnails. Fixes #50

Disco.Models/Repository/Attachment/IAttachment.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace Disco.Models.Repository
+{
+    public interface IAttachment
+    {
+        int Id { get; set; }
+
+        object Reference { get; }
+
+        string TechUserId { get; set; }
+
+        string Filename { get; set; }
+        string MimeType { get; set; }
+
+        DateTime Timestamp { get; set; }
+
+        string Comments { get; set; }
+
+        string DocumentTemplateId { get; set; }
+
+        AttachmentTypes AttachmentType { get; }
+    }
+}