A few code reorganizations

Change-Id: If4632fecc7085e5448226c2061e08546757eda9b
diff --git a/core/conf/rule.cpp b/core/conf/rule.cpp
index 55dc59d..efaac3e 100644
--- a/core/conf/rule.cpp
+++ b/core/conf/rule.cpp
@@ -21,7 +21,8 @@
 
 #include "rule.hpp"
 
-namespace nsl {
+namespace ndn {
+namespace delorean {
 namespace conf {
 
 Rule::Rule(const std::string& id)
@@ -78,4 +79,5 @@
 }
 
 } // namespace conf
-} // namespace nsl
+} // namespace delorean
+} // namespace ndn