rename CreateLogoThumbnailWorker -> CreateShopLogoThumbnailWorker
add CreateShopLogoThumbnailWorker spec
add ThumbnailWorker
add CreatePostImageThumbnailWorker
generate Post#image thumbnails
use Post#image_url(:thumbnail)
improve HexdigestNamedVersion doc
add PasswordCrypto doc
add LoginConstraint doc
add EachValidator doc
add UrlValidator doc
add Geo doc
add ApplicationHelper doc
add Public::ApplicationHelper doc
add Public::ApplicationController doc
add LikeSearch doc
add GeoUtil doc
add BaseVerifier doc
add BaseSitemap doc
fix invalid yard syntax