undertook to dev log
improve log
develop log func
remove unnecessary comment
mod gif logic
add log logic
improve log func
sleep time in to the instance value
Merge branch 'ph9_dev' into ph9_review
change value name
Merge branch 'ph9_dev' into ph9_review
almost finished phase9

Conflicts:
	app/assets/javascripts/common.js
	app/views/layouts/application.html.erb