Add instructions to enter directory before doing npm install
Add explanation about using local data file
Add tip to install jshint globally
Update instruction 2.1

Update task 2 step 1 - indicate you've to open this file in your code editor
Update task2.js

Fout bij de multiply nummers
Merge pull request #2 from Wasknijper/patch-1

Update task2.js
Update task 1
Update Task3.js

Give better feedback in case there's an error in your module JS