Merge pull request #57 from tariel/master

Updated assignment link
Schedule change
Task runner tasks
Participation tables for late lectures
Gulp presentation link
Presentation participation
Merge pull request #58 from merilainen-metropolia/patch-2

Gulp presentation link
Merge branch 'master' of github.com:paazmaya/modern-web-tools-with-node-js-book
One more good citizen
Few words in the assignments
Wrong date
Add quiz questions for JSLint and JSHint. Fixes #27, #28.