Fix RSS auto discovery when relative path feed
favicon works!

- I use mini_magick for simple our task, btw, where is ImageUtils??
- use Addressable::URI instead of URI for such 日本語.jp
- use Nokogiri instead of Hpricot for some (potentially) encoding problem
Add nokogiri
Fix favicon for non png
 #42 move fetch_favicon! method to Feed model
#42 ensure favicon fetch when member#subscribe_feed
Merge branch 'favicon' of https://github.com/uu59/fastladder into uu59-favicon
Merge branch 'master' of github.com:fastladder/fastladder
Merge branch 'uu59-favicon'

Conflicts:
	Gemfile