added post_comments model and controoler. belongs_to user and post. has_many on the other side. added comment form post show page, redirect to post after comment added or unsuccessful. show comment count on the posts page.
displaying all comments for a particular page along with the link to the specific user, showing how long ago the comment was created.
added number of comments against each post in the newsfeed.
Added pluralized helper to show 1 coment or 3 comments in news feed. removed the delete link for posts.