Adding a new post, and wiring up stuff so that the post is connected to its
contributor
Added the "view all posts" as the index action of posts.

The posts are rendered descending order, by the time they were created at.
Added the moderation status of a post when the post is displayed.
Posts make sense both when treated independently and when treated as children
to a particular contributor. So, they can be reached in two ways.
If the contributor ID in the parameter list and the contributor ID as seen
from the URL is the same then a sentence can be printed.

* This can be used after the login and authentication has been completed.