Add image index to jpg image info

Author: Austin Hyde

src/main/java/com/koadweb/javafpdf/FPDF.java

@@ -613,6 +613,7 @@ protected Map<String, Object> _parsejpg(final File file) {
 			image.put("cs", colspace); 
 			image.put("bpc", 8); 
 			image.put("f", "DCTDecode"); 
+			image.put("i", Integer.valueOf(this.images.size() + 1)); 
 
 			InputStream f = new FileInputStream(file);
 			byte[] data = new byte[f.available()];