Add interface for managing roles, fix issue with local jquery path.
Add a is_system column to roles and permissions, which will allow you to check if a role or permission can be modified.
Set default values for is_system for roles and permissions the system relies on.
Give users a way to manage permissions
Fix issue with id value not being set for new roles.
Switch to using the is_system database column and move some hardcoded strings to the language files.