HTTPRequest needs to be refactored

[mlanca-c]

The class HTTPRequest has two problems:

1. it isn't able to receive a string as a parameter
2. it doesn't parse the URI or m_resource like we so desperately need (std::regex is from c++11 so a parsing here is necessary to get the host and port)

What I'm proposing here is to refactor this class and create a helper class named URI for the resource that resembles something like this:

struct Uri {

        Uri(std::string uri);
        ~Uri(void);

        std::string toStr(void);
        std::string pathWithRoot(std::string root);

        // std::string m_target;
        std::string m_scheme;
        std::string m_host;
        std::string m_path;
        std::string m_query;
};

and HTTPResponse (only the modifications)

    // (....)
        HTTPResponse(std::string req_str);

    // (....)
        shared_ptr<Uri> m_resource;

    // (....)