Change associations, add tests
Rename custom objects to news objects
Add news_objects_controller
First tests for news_objects_controller
Add first test for news_objects_contr#update
Fix specs
Add #create with json format response
Add will_paginate to Gemfile
Rename column in the categories table
Add index view
Refactoring index view, add partial
Fix test after rename column in categories table
Show date in word in index.html
Set default per_page value in NewsObject
Add validation of uniqueness category' name
Fix self method in NewsObject
Show current from all paginated news in index.html
Show requested per_page_count and category_id  news_objects
Filter news_objects with range of dates
Show news_object with filtered category and date range