added logging module and a sandbox project

demo/sandbox.cpp

@@ -0,0 +1,15 @@
+#include "matador/object/schema.hpp"
+
+#include "author.hpp"
+#include "book.hpp"
+
+using namespace demo;
+using namespace matador;
+int main() {
+  object::schema tree;
+
+
+    tree.attach<author>("authors");
+    tree.attach<book>("books");
+
+}