Merge pull request #5 from paazmaya/master

merge
issues added
Lecture 8 task 2 added
Lecture 4 task 2 added
link added
fixed
MongoDB quiz added
quiz format updated
javascript scope quiz added
Merge pull request #160 from Markoham/master

tasks added
Merge pull request #162 from Markoham/patch-2

MongoDB quiz added
Merge pull request #163 from Markoham/patch-3

javascript scope quiz added