add letter_opener gem
restrict project access to admin users
hide admin only actions from views
add protected admin controller
add ability for admin to create users
admin can create admin users
add update method for admin users
add delete method for admin users, protect against self-deletion
fix mass assignment error
projects are only viewable to users with permission
index only shows projects that users have permission to see
restrict reading tickets
restrict creating tickets with CanCan
users cannot edit tickets without permission
users cannot destroy a ticket without permission
hide links based on user permissions
add a permissions screen for admins
admin can assign permissions for all actions
add a seeds file
fix check box bugs