Merge pull request #4 from guilhermetavares/master

Mensagem de erros customizadas, resposta do WS da Cielo fica atrelada à instância para facilitar o acesso dessas informações (self.response).
added CONTRIBUTORS
pr improvements
version 0.5
added LICENSE
Fix my name
Merge pull request #5 from anacarolinats/patch-1

Fix my name
Merge remote-tracking branch 'rpedigoni/master' into topic/real_upstream

Conflicts:
	setup.py
Added token-related xml files to MANIFEST.in
Added lib and include to .gitignore