1.8.4 - Fixtures rework

CMS Fixtures import/export functionality is completely rewritten. Notable (and potentially breaking) changes:

• Page attributes are stored in a attributes.yml file instead of _{page_slug}.yml
• Same applies to layouts and snippets.
• Page fixtures properly assign target_page attribute
• It's possible to define categories for pages and snippets in the attributes.yml
• Categories can be imported/exported. Even the ones that are not currently used.
• Files can be imported/exported as well.
• Rake task will 'force' import everything. Meaning it's not going to be checking for freshness of the data.
• Files require to have unique filenames for a given Site.

See example fixture files for structure reference. Run rails g comfy:cms to update them.