validation: sites not assigned to all included/extended templates
once saved, the template name field becomes readonly
changed template loader to search for templates in all sites. Required when compiling templates that use other templates.
fixed nodelist scan to return templates used
removed pasted code from sekizai.helpers, method _extend_blocks
handled unassigned sites
added template validation on site form
changed error messages
fixed validation to check all templates assigned to the unassigned site
fixed query for orphan templates
changed tests with shared sites to work with the modified loader
moved imports on top
added missing import (mistakenly deleted)
removed unused middleware classes
added djangotoolbox to dependencies
set TEMPLATE_DEBUG to True during template validation
added tests for template validation
created method for error messages
Merge branch 'LUN-65'