WIP: Add Director Role

[michaelhiiva]

Summary

Resolves #223 by adding a Director role which is an extension of
the Staff role.

Changes

• Added Director to User Model.
• Added Director to create_user.rb script.
• Added Director as a Staff with Ability to Manage Tournaments.
• Added Director Information to Radio Button.
• Updated Description for User's view.
• Added director context to users_controller_spec.rb.

[jaredbeck]

Looks like a good start! This is exactly how I intended for the users.role column to be used.

[neagle]

One naming request: could we change this to "Tournament Director" and "TD"? "Director," in the context of a Go Congress, usually means the one or two people in charge of the whole shindig.