Added more filters

 * gavern_social_api
 * gavern_thumbnail_caption
 * gavern_blog_name
 * gavern_blog_desc
 * gavern_logo_html
 * gavern_meta_description
 * gavern_meta_keywords
 * gavern_og_title
 * gavern_og_image
 * gavern_og_type
 * gavern_og_description
 * gavern_og_url
 * gavern_og_custom
 * gavern_breadcrumb
 * gavern_breadcrumb_home