Rewrite and revert some code to build in pre-C++11

Rewerite and revert some code that this library can be built in pre-C++11 and C++11 env.
Main Change List:
1. using -> typedef
2. not using auto & decltype
3. not using raw string literals
4. ..., other c++11 features will be chosen to compile, depending on env.

example/readFromStream/readFromStream.cpp

@@ -1,4 +1,5 @@
 #include "json/json.h"
+#include <cstdlib>
 #include <fstream>
 #include <iostream>
 /** \brief Parse from stream, collect comments and capture error info.