Release SkeekS CMS 2.0.15

And here is the next update, which fixes critical errors for CMS in php 7, and a few other useful things.

• Finalization of ajax manager
• Fixed include_once paths to include files
• is depricated params in UrlRuleContentElement and UrlRuleTree !!!
• Renamed some components
• Module management menu
• Setting page addressing through SEO settings