Update comment settings for content types described in CFD-50
Fixes and cleaning
Abstract (generic) class to generate comments
Generate dummy comments for article_1
Blogpost comments added
Create dummy document comments
Dummy Event comment content
Create Photo comments content
Create Task Comments content
Dev lines removed from code.
Merge pull request #45 from capacity4dev/feature/CFD-50-Add_comments_to_the_demo_content

Add comments to the demo content