Added first version of GUI for order's devices

In that page we will be able to create the devices
requested in a specific order.
Also made some minor changes in already existing GUIs.
Updated animal entity and related files

Dropped the password field and created a relation
with the device's order. Also added a couple of useful
methods to the animal_service.
Added page for adding new devices under an order

Also mapped a url for deleting wrongly introduced
devices.