Acknowledgements

PPL was created at Escola Politecnica da Universidade de São Paulo (http://www.poli.usp.br) from 2006 to 2007, with substantial support from CNPq (http://www.cnpq.br) during the first year of development and FAPESP (http://www.fapesp.br) during the second one.

We hope PPL works well and provides useful assistance and guidance.

Good luck!

André da Costa Teves

Danillo Paulo Couto