Improving pt_Br\Internet extensibility
Improving code and adding documents

Code extensibility was improved by changing private property to protected;
Additional methods to generate some Brazilian documents were included
More robust brazilian phone generator

PhoneNumber was rewritten to enable different phone rules in Brazil.
Now it generated area codes, landline and cellphone numbers, obeying
the rules for the new digit that was added in the last years (and
will still be added in the future). The formats are now local-only,
like the original PhoneNumber class.
Adding documentation about pt_BR providers