A few code reorganizations

Change-Id: If4632fecc7085e5448226c2061e08546757eda9b
diff --git a/core/auditor.hpp b/core/auditor.hpp
index 87e67b5..f47e856 100644
--- a/core/auditor.hpp
+++ b/core/auditor.hpp
@@ -29,7 +29,8 @@
 #include <ndn-cxx/encoding/buffer.hpp>
 #include <vector>
 
-namespace nsl {
+namespace ndn {
+namespace delorean {
 
 class Auditor
 {
@@ -57,6 +58,7 @@
             const Name& loggerName);
 };
 
-} // namespace nsl
+} // namespace delorean
+} // namespace ndn
 
 #endif // NDN_DELOREAN_CORE_AUDITOR_HPP