Address Merger test issue and removed dead code.

src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs

@@ -89,7 +89,7 @@
             using (var document = PdfDocument.Open(result, ParsingOptions.LenientParsingOff))
             {
                 Assert.Equal(2, document.NumberOfPages);
-                Assert.True(document.Structure.CrossReferenceTable.ObjectOffsets.Count < 24,
+                Assert.True(document.Structure.CrossReferenceTable.ObjectOffsets.Count <= 24,
                     "Expected object count to be lower than 24");
             }
         }

src/UglyToad.PdfPig/Writer/PdfStreamWriter.cs

@@ -142,21 +142,6 @@
             return referenceToken;
         }
 
-        private IndirectReferenceToken FindToken(IToken token)
-        {
-            foreach (var pair in tokenReferences)
-            {
-                var reference = pair.Key;
-                var storedToken = pair.Value;
-                if (storedToken.Equals(token))
-                {
-                    return reference;
-                }
-            }
-
-            return null;
-        }
-
         private static void WriteString(string text, Stream stream)
         {
             var bytes = OtherEncodings.StringAsLatin1Bytes(text);