add preferenced_publications to database. define incrementer method that takes any database field of preferenced_foos as a hash and sets its value.
fix failing tests based on factory and value.to_i
changed incrementer method to value.to_i to not coerce nil to fixnum
recommender spec.
changes to iframe javascript and feedback form action. use data tag in html.
test coverage using simplecov
sign out
require simplecov in the spec helper.
authorization before viewing channel show page.
comments from jeffrey.
getting rid of Article#update_user_feedback! method in favor of ActiveRecord setter.
other changes for getting rid of Article#update_feedback!
fixing tests after jeffrey code review. (some routes changed, esp. signin_url.
complete fixing tests from jeffrey code review.
progress towards Article#compute_closeness
Complete "compute_closeness" with publication.
remove coverage files. previously put in gitignore.
Merge branch 'master' into using_publication

Conflicts:
	app/controllers/channels_controller.rb
	app/views/channels/show.html.erb