use https for flickr api
remove duplicate configuration
bump version 4.0.4
update latest dependencies
added 2.1 and head into travis
upgrade rspec3
drop ruby 1.8 support
bundle update
flickr.rb: fix "[ERROR] flickr.rb: failed to get photo."

Do not read zero-byte cache, and delete cache if SSL certificate
verify failed.
js/flickr.js: use https for flickr api
bundle update
remove trailing whitespaces
Send Yo when entry or tsukkomi is added
Stop sending Yo for spam comments