A few code reorganizations

Change-Id: If4632fecc7085e5448226c2061e08546757eda9b
diff --git a/core/conf/checker.cpp b/core/conf/checker.cpp
index d00bb34..30d6d2b 100644
--- a/core/conf/checker.cpp
+++ b/core/conf/checker.cpp
@@ -23,7 +23,8 @@
 
 #include <boost/algorithm/string.hpp>
 
-namespace nsl {
+namespace ndn {
+namespace delorean {
 namespace conf {
 
 Checker::~Checker()
@@ -173,4 +174,5 @@
 }
 
 } // namespace conf
-} // namespace nsl
+} // namespace delorean
+} // namespace ndn