custom field `active' or `visible' set to false. Fixes #272.
export.rb exports targets with field_attributes['target'] = target_klass._parent.slug but import imports it with: target_content_type = site.content_types.where(:name => association.target).first this fails if one uses capitalized names for Models. i changed the default.zip to contain a site yaml with capitalized Model-Names too.
…ompatibility with syck init.
… a Nil. This revision doesn't really sort Nils, rather ignore them.