Adds support for Samba System.

Samba is the system behind most bike sharing services in Brazil. It was
developed by Serttel and is sponsored by Itaú Bank.

This commit adds support for Samba and configuration files for São Paulo
and Rio de Janeiro.
Add support for 8 new Brazilian cities (Samba system)

Belo Horizonte, Santos, Sorocaba, Petrolina, Recife, Salvador, Brasília
and Porto Alegre added.
Samba: Fix number of available bikes and free spaces
Samba: fix extra.status
Samba: update extra.status messages
Add copyright notice on Samba module
[style] Fix indents in samba.py
Make filler.py output JSON without trailing whitespace
Adds a slots (total slots) field in samba