Add Post#newer and Post#older to wrap pagination call
Add replies to posts
Make partial for posts
Add down migraton
Remove unused date range constraint
Add Post#last_reply_from_name
Add style for badges in tables
Add helper for posts to display dates nicely
Remove old column from params
Use from_email, not sender for private replies
Show time of day for posts from today
No need to escape HTML in modern Rails
Replace Post#sender with from_email and from_address. Both non-DB attributes. Now DB columns.
Show replies on Post#show page
Fix acceptance test