Add new providers facebook and twitter
- Update facebook provider because facebook changing their API
- Add github provider
- Add twitter provider
- Update README
Signed-off-by: Gustavo Jaruga Cruz darksshades@gmail.com Signed-off-by: Thiago Ribeiro thiagitosouza@gmail.com Signed-off-by: Alessandro Caetano alesasndro.caetanob@gmail.com