rename the previous info session to finfo session.
prepare the info session on 2014-03-19
Fix the wrong lesson 17 url and the submodule issue.
fix submodule
Update the info slides order.
update the class size description.
Update the fb demo.
Add comments on the card matching game
Add lesson 19.
Merge branch 'gh-pages' of https://github.com/ga-students/FEWD_HK_4 into gh-pages