Update database schema for users table

Summary:
Commits f60cd7aa and b273524a adjusted the users table schema
to include a full name field. Schema is adjusted accordingly.

Fixes T836.

Test Plan:

• Perform a fresh installation
• php artisan account:dump

Reviewers: dereckson

Maniphest Tasks: T836

Differential Revision: http://devcentral.nasqueron.org/D378