Merge pull request #125 from existdissolve/development

Related Content/Linked Content Tweaks CONTENTBOX-55
CONTENTBOX-55
related content installer and auto update patches
CONTENTBOX-471 #close
Clear the content cache whenever a comment is removed
CONTENTBOX-463 #close
Duplicate Slug Error Across Content Types
CONTENTBOX-473: Fixed case change in content slugs
CONTENTBOX-472: ContentStore slugs change fix