Added mailing list info to README.md page

Signed-off-by: Nuno Martins <nuno.martins@caixamagica.pt>
Merge pull request #15 from nunogmartins/readme_to_ofbook

Added mailing list info to README.md page
outline for c++11 section
gitignore, advanced graphics and network chapters
fix advanced graphics outline + add adv graphics and network to general outline
split chapter and outline into 2 files
revised my outline
added outline item
removed ++ from folder title for cleaner github URL