Update NetRequestImpl.cpp

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    //SR ID - EMBPD00120791
    //Issue Description - <System API>Proxy is not getting set using Rho.System.httpProxyURI.
    //Fix Provided - Closing existing HINTERNET handle i.e. m_hInternet and recreating the m_hInternet as we don't know when user will set the proxy using httpProxyURI.
    //Developer Name - Abhineet Agarwal
    //File Name - NetRequestImpl.cpp
    //Function Name - initConnection(rho::boolean bLocalHost, LPCTSTR url)
    //Date - 10/07/2014
    /****************************************/