fetch: Switch code to use ndn-cxx

This commit also moves code to ndn::chronoshare namespace and changes
logging to show file and line number of the logging statement.

Change-Id: I075320644166cea9d5d3ef65bb26a2cabfd4dc5a
diff --git a/wscript b/wscript
index 117e90c..8ac2af3 100644
--- a/wscript
+++ b/wscript
@@ -108,6 +108,7 @@
                                   'src/file-state.cpp',
                                   'src/action-log.cpp',
                                   'src/object-*.cpp',
+                                  'src/fetch*.cpp',
                                   ]),
         use='core-objects adhoc NDN_CXX BOOST TINYXML SQLITE3',
         includes="src",