Removed, Added and Tested.

We have removed some unrequired files. We have added new files and tests
files for the new Roles table.

We have one test for the Roles.
Added a factory for creating roles. Validity tests

Tested the validity of the roles, weather we can add properly forme roles
and weather we cannot add empty roles.

Added a factory file, role.rb to add an adminRole and a userRole
for testing ppurposes.