Refactoring Issue #19
Issue #19
Validation of publisher name (Issue #19)
Refactored according to recomendations: https://github.com/scieloorg/balaio/pull/49
Merge branch 'master' of git://github.com/scieloorg/balaio into 19

Conflicts:
	balaio/tests/test_validator.py
	balaio/validator.py
Merge pull request #47 from robertatakenaka/19

Issue #19 - Validation of publisher name