Moved the default setting of db.yml to the development environment

header.
The moderated flag of a post can be edited by sending a delete request to 
the URL defined in routes.rb
Added the moderated/unmoderated, rollback, accept post buttons to the
post show page.

These buttons are rendered only if the current signed in user is a verified
administrator
The moderate_content action added to the administrator controller.

This action toggles the moderated flag of a post