Add dedicated client view of order

[krzykamil]

Also rework routes a bit to not mix client/customer this much
Also move client orders into scope path
Move login out of client orders controller into client controller
Client controller serves as a mock of actual authorization
Client Orders controller now holds actions connected to orders scoped by client
Added relation of client order with actual order, for easy access in the view
The regular show view of order for scoped view of a client is a bit smaller, does not have client name and link to history, restricted to staff
Since orders and client_orders are scoped separatly in cqrs part of the app I thought it would make sense to scope client orders - subsidiary of actual orders - to their connected client in the rails app too.
Done for those issues:
#104
#94