The sqlite3 gem can't be used in production.

The sqlite3 gem, if used in production, will throw up an error as
Heroku's pre recieve hook will reject the push, if we try to install
sqlite in production environment
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
Added the timeoutable feature to the adminsitrator and contributor models.

Administrator session timesout after 10 minutes of inactivity.

And contributor session times out after 2 hours of inactivity.
Added the row highlighting in the table view of all the posts.

The unmoderated posts are shown in red, whereas all the moderated posts
are shown with green highlighting.

This can be easily customised to the final design.
Added view "my posts" button in the contributor profile page and main layout.

The layout will have the "my posts" section in the drop down on the right 
top corner
Merge branch 'master' into heroku-deploy

* Front end improvements *

- My posts section
- View a post button, in the posts#index page
- posts#index page has color coded table rows depending on whether
the post has been moderated or not. (red for unmoderated, green for moderated)
Added the active Admin Gem to the gemfile
Installed the activeadmin to all the three models and one model for
the maintainers, (who can access the admin dashboard)

- Adminstrators
- Contributors
- Posts
- Maintainers
- Dashboard

Maintainers model was created. (the associated fixtures, test cases and model
file have also been committed)
Added the active admin initiliazer
Active Admin JS and CSS Assets added.
Ran rake db:migrate. Migrate the db migrations created by ActiveAdmin.

Also, added the routes for ActiveAdmin.

Edited the DB Schema to add the maintainer model
Remove require_tree to ensure that the ActiveAdmin CSS does not overwrite
the custom CSS of the site.

According to:

http://stackoverflow.com/a/22267892/2080089
Merge branch 'admin-interface' into heroku-deploy

Conflicts:
	Gemfile

Fixed the conflict. More stuff was added to the Gemfile.

Since there was a newline at the end of Gemfile, in the heroku-deploy
tree, when it got merged into admin-interface, it threw a trivial
merge conflict.