Merge branch 'gateway_http' of https://github.com/jamilatta/balaio into jamil_gateway_http

Conflicts:
	balaio/models.py
Merge branch 'gateway_http' of https://github.com/jamilatta/balaio into jamil_gateway_http
Merge branch 'master' of git://github.com/scieloorg/balaio into 91

Conflicts:
	balaio/models.py
tentativa de testes do gateway
Merge branch 'master' of git://github.com/scieloorg/balaio into 91

Conflicts:
	balaio/models.py
Attempts API and their tests
ArticlePkg API tests
Merge branch 'gateway' of https://github.com/jamilatta/balaio into 91

Conflicts:
	balaio/gateway_server.py
	balaio/models.py
Merge branch 'master' of git://github.com/scieloorg/balaio into 91
Attempts API and its tests (#91)
Attempts API and its tests
Merge branch 'master' of git://github.com/scieloorg/balaio into 91
Merge branch 'master' of git://github.com/scieloorg/balaio into 91
Endpoint Validation
Ajustes de nomeclatura
Attempts API and its tests
Refactoring of the tests
Ticket endpoint
Created AttemptsAPITest.setUp() in order to prepare a object request
Attempts API tests for attempt() (Issue #91)
Ajustes no models.py