Added featured field to categories_items

Signed-off-by: DanielDimitrov <dimitrov.dan@gmail.com>
Refactoring, all_featured_items moved to items_controller

Signed-off-by: DanielDimitrov <dimitrov.dan@gmail.com>
Added back all_featured_items to categories, used more efficient method for return featured items for category

Signed-off-by: DanielDimitrov <dimitrov.dan@gmail.com>
better code style
Added pagination to new featured items methods

Signed-off-by: DanielDimitrov <dimitrov.dan@gmail.com>
Added image to Category

Signed-off-by: DanielDimitrov <dimitrov.dan@gmail.com>
Merge pull request #18 from Wyshme/category_db

Added featured field to categories_items