add Path::to_s()

src/lib/include/jes/Path.h

@@ -12,6 +12,7 @@ namespace jes
         Path(const std::string & path);
         Path dirname();
         Path join(const Path & other);
+        const std::string & to_s() { return m_path; }
     protected:
         void clean();
         std::string m_path;