Refactoring archive page

Remove on of two menu items (items - packages), and left there "archive"
Merge functionality of those two pages into archive
Create list view for archive
Add some new icons for file types and action buttons
Refactor thumbnail archive view

Added hover box (selected item) with func buttons
Made simple directives to clean up the code
Article edit page

Clean unnecessary and jquery oriented HTML
Add item urgency labels
Fix styling issues

Fix issues on general settings page which raised up after refactoring
tabs
Merge remote-tracking branch 'nikola/archive-page'

Conflicts:
	app/scripts/superdesk/items/module.js
Merge remote-tracking branch 'nikola/master'

Conflicts:
	app/scripts/superdesk/settings/views/main.html
Sync widget grid properties on resize.

SDUX-52
Test alternative structure for apps.

Move items app from superdesk/items to superdesk-items folder.
Move each plugins into its own top level folder.