add comments and refractor code
Merge branch 'master' of github.com:Green-Snake-Platinum-Kangaroo/Green-Snake-Platinum-Kangaroo

Conflicts:
	js/clock.js
add some comments
Merge branch 'master' of github.com:Green-Snake-Platinum-Kangaroo/Green-Snake-Platinum-Kangaroo
clean up duplicate code
refractor code with comments
upgrade three js version from 58 to 69
Merge pull request #29 from victorleungtw/master

Upgrade three js from version 58 to version 69