Added doctype and viewport meta tag
Merge pull request #1 from tagawa/optimizations

Changed click listeners to mousedown/touch listeners
Thanks!
Merge pull request #2 from tagawa/html

Added doctype and viewport meta tag
Merge and Merge!
remove disuse style
arrange view
fixed img css
change id to user roles
Merge pull request #4 from mizuman/changeID

change id to user roles
change host image size
add error handler
Added support for Firefox