Added option to define the custom RSS URLs
Added submenu indicators
Fixed a notice in the GK Comments widget.
Added the priority parameter in the Customizer controls declaration.
Back-end code optimized with JSHint + small fix for the update version comparision
JSHint and JSprettifier used in the other JS files
Small fix in the paths on the Font Awesome CSS code
Small fix for the submenu indicators on the mobile menu.
Fixed menu script.
Php include replaced by get_template_part function.
Added links on the non-single post pages to featured images.
Added togglers based on the Font Awesome.
Added version display and social media to the back-end header.
Added support for WordPress Multisite in the GK NSP widget.

User can now specify ID of the blog which will be data source for the
blog posts.
Added code to remove settings for unexisting widgets.
Added support for the manifest attribute in the <html> element.
Added Open Graph default image - for Pinterest too.
Added 4 new filters for the available Social API buttons
Optimized Widget Rules script.
Small fix for the taxonomy_term field in the Widget Rules.