Make project only visible to users with permission to see them
Don't show projects that a user doesn't have permission to see
Restrict reading tickets to correct project scope
Restrict creating tickets to only users
Restrict ticket updating to only those who have permission
Restrict tickets#destroy to only those with permission
Restrict actions in TicketsController based on permission and hide links
Add permissions screen for admins
Add creating, editing, updating, deleting tickets to assigning permissions interface
Add seed data