Minor fixes to remove warnings in VS2013.

Also fixes VS2015 build due to missing #include <iterator>
diff --git a/source/binary.cpp b/source/binary.cpp
index 72b04ef..ae11152 100644
--- a/source/binary.cpp
+++ b/source/binary.cpp
@@ -29,6 +29,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cstring>
+#include <iterator>
 #include <limits>
 #include <unordered_map>