This is the beginning of the construction of a "Load more" result page.

Conflicts:
	Gemfile
	Gemfile.lock
	app/models/user.rb
	app/views/layouts/application.html.erb
	app/views/shared/application/_header.html.erb
	config/initializers/devise.rb
	config/initializers/repositories.rb
	config/orient_db.yml

Conflicts:
	app/models/learning_object.rb

Refactor code to use "rails generate scaffold" instead of "rails generate controller".

Also fix bug on SOLR URL not being on a configuration file.

decouple rater class from sort alg, create concrete classes for item, rated item and basic rater strategy