update item model and rename item_image to package_image
update Package::search to Package::stocks
added selectize scripts
added package image relation and item package id rules
move out catalogs entry to parent menu list
update selectize to standalone version
fix selectize css mistake
update packages and catalogs module

  - added search package on catalog form
  - added controller to search package
Merge branch 'features/packages' of github.com:enfonius/matrix into features/packages

Conflicts:
	application/classes/Model/Item.php
	application/classes/Model/Package.php