sprinkle-uf-tweaks

Fixes/tweaks a few "issues" with the default UserFrosting installation, including:

• Removes the uri_dashboard permission from 'users' role
• Adds the uri_dashboard permission to the site-admin and group-admin roles
• Restructures the dashboard to be more role-friendly
• Fixes the authenticator generating 'PHP Notice's (parameter to count() must be an array)
• Don't send the user to the account settings on login, send them to the index instead
• Adds a user creation button to the group admin page
• Fixes showing user activity depending on the current user's permission to view it
• Allow site-admins to view roles & permissions
• Allow site-admins to edit basic role details (name, slug & description)