BOARD:
  - content types / models (CRUD)
    - require a custom field at least
    - pre-select the first custom field as the highlighted one
  - contents (CRUD)
    - sort contents

BACKLOG:
- liquid rendering engine
- theme assets
- assets collection
- custom models
- asset collections: custom resizing if image

- devise messages in French
- localize devise emails
- refactoring admin crud (pages + layouts + snippets)
- refactoring page.rb => create module pagetree
- refactoring: CustomFields::CustomField => CustomFields::Field

BUGS:
- theme assets: disable version if not image
- assets uploader: remove old files if new one

DONE:
x admin layout
x logout button
x slugify page
x validation page slug
x update position when assigning a new parent
x remove all descendants
x slug from title
! update "path" when changing slug (new page too) ?
x mettre a jour le chemin dans _form si slug et/ou parent change
x slug for 404 and Index pages can not be modified
x store node closed or open in cookies
x snippets section
x menu items have to be translated
x layout needs at least content_for_layout
x parts js/css:
  x codemirror
  x change bg (separator)
  x when a tab is selected, if we change layout, we should move to the first visible one
x page parts
x layout part should be always in first
x pages section (CRUD)
x my account section (part of settings)
x add new accounts
x edit site settings
x slug unique within a folder
x layouts section
x create new site
x share session accross domains (only subdomains)
x destroy site
x remove all pages, snippets, ...etc when destroying a website
x destroy account
x can not delete the only one admin account for a site
x create 404 + index pages once a site is created
x can not delete index + 404 pages
x validates_uniqueness_of :slug, :scope => :id
x domain scoping when authenticating
x theme assets
  x create / update
  x slug 
  x filename from slug
  x can not replace a javascript by a stylesheet
x asset collections
  x create / update
  x sort assets
  x removing assets
  x assets
  x destroy
x custom fields:
	x renaming fields
  x extract a plugin from custom fields	
	x ui
	x field position
	x rename asset_field
  x nested attributes
  x keep tracks of all custom fields (adding / editing assets) + order them
	x duplicate fields