re #435 Added title column.

Made name unique.
re #435 Fixed constraint.

Groups are related to users, not roles.
re #435 Set name as title, and added alphabetic names.

Also removed Super Administrator role.
re #435 Users may have multiple roles.
re #435 Added methods for checking for roles.
re #435 Implemented new interface.
re #435 Updated dump file.
re #435 Re-factored model.
re #435 Cleanup.
re #435 Added groups model.
re #435 Added groupable behavior.

This behavior takes care of storing and deleting user group relationships.
re #435 Made table groupable.
re #435 Cleanup.
re #435 Cleanup.
re #435 Fetch groups using the group model.
re #435 Grab the role id by its name.
re #435 Improved check.

Authenticated users can create sessions.
re #435 Removed an undesired condition.
re #435 Use row title for display.
re #435 Use groups template helper for rendering a list of groups.