Added root url
Added new Item form, fixed highlight when we move the current playing Item
Not used anymore
Fix
Added youtube_ids left to seed
Added PlaylistItemAssignationController with "index", "create", "update" and "destroy" actions
Added PlaylistItemAssignation (View) to add a new
Revert "Added PlaylistItemAssignation (View) to add a new"

This reverts commit 2f3399ba05fbc3bcc4f42c863400acfd8e621fb8.
Added SortablePlaylist.Views.PlaylistItemAssignationsNew
Render the right view (moved from Item to assignation )
Added "playlist-item-assignations" route
Added route and changes on views and templates
[FIX] highlight the right for the 3 cases possible