split configuration into pieces

Change-Id: I3039a3e15d9637e05b0f9678a7141258fb49e983
diff --git a/src/detail/error-encoder.hpp b/src/detail/error-encoder.hpp
index 99d9dd8..67fe80f 100644
--- a/src/detail/error-encoder.hpp
+++ b/src/detail/error-encoder.hpp
@@ -21,7 +21,7 @@
 #ifndef NDNCERT_DETAIL_ERROR_ENCODER_HPP
 #define NDNCERT_DETAIL_ERROR_ENCODER_HPP
 
-#include "configuration.hpp"
+#include "detail/ca-profile.hpp"
 
 namespace ndn {
 namespace ndncert {