Fix compilation warnings of CHwSMTP

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Fix compilation warnings of MyGraph.cpp

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Fix compilation warnings of GitRev.cpp

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
This is git, not subversion

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update build instructions

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>