revised HW2
HW 5
HW4 - gov API
add more lesson 2 homework
fix formatting
Merge pull request #24 from wilsonlam3/master

submit HW4 & HW5, revised HW2 & HW3
Merge pull request #25 from chyleung/master

upload midterm
add starter code for lesson 8
add lesson 9 materials
add class 5 homework
Merge branch 'master' of https://github.com/ga-students/BEWD_2_HK
upload user story and lab_26Nov