Replace Rfeedfinder with FeedSearcher

In addition, I found that hpricot is used in this rails application but not written in Gemfile.
Because Rfeedfinder was using it, it had worked without any problems.
add auth helper method
add signin/signout feature spec

* rename requests to features (it become default from capybara2.0)
 * refs: http://alindeman.github.com/2012/11/11/rspec-rails-and-capybara-2.0-what-you-need-to-know.html
Fix signup: secondary user cannot signup

Skip auth_key validation for default value(nil).
Merge pull request #52 from mzp/fix_signup

Fix signup: secondary user cannot signup
Avoid to define helper method on top-level context

refs: https://github.com/fastladder/fastladder/pull/48#discussion_r3403790
Merge pull request #43 from r7kamura/rip_rfeedfinder

Replace Rfeedfinder with FeedSearcher
Merge branch 'banyan-add-auth-feature-spec'
remove loadJS
Fix RSS auto discovery when relative path feed
locate javascripts as its own role
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
Update feed_searcher to 0.0.3
Merge pull request #57 from makimoto/update_feed_searcher_003

Update feed_searcher 0.0.3
Merge branch 'favicon' of https://github.com/uu59/fastladder into uu59-favicon
Merge branch 'master' of github.com:fastladder/fastladder