Removed all the views from both the administrator and the contributor
controllers that can interact with the model.

All tasks:
* create
* edit
* update
* delete
are handled by Devise.
Made contributor a Devise Model. 

Removed the Email definition from the first description, and it is added in the second 
db migration that alters the table.
The name parameter will be sanitized and accepted when the object is 
either created or edited
Contributor model is a Devise model.
Enabling scoped views.

The registration add and edit views are scoped by views that are present inside the views/<controller_name>/
folder.
Removed all the actions from the controller that interacts with the model
Added the contributor Menu.
Added the nested if-else structure to render the proper dropdown
depending on whether the administrator is signed in or a contributor is 
signed in, etc.