finish basic function of calculator
fix code style in scripts
add basic files for alarm-clock
new way to manage assets
Merge branch 'dev' into feature.alarm-clock

Conflicts:
	tags.json
add LICENSE
Merge branch 'feature.assets' into dev
arrange assets
reduce lines
manage assets
Merge branch 'feature.assets' into dev

Conflicts:
	_layouts/base.html
remove comment
remove useless codes
add page for alarm clock project
finish alarm clock
fix UI for alarm clock
remove icon from buttons: alarm clock
move map data together and build RSS
move files to assets/ except html files
rm assets/*/tags.* (instead using assets/*/_config.*)