Specify a version of OpenFisca-France for travis
Specify a version of OpenFisca-France for travis

I did not find a way to express: give me the version of OpenFisca-France
which depends on the same version of OpenFisca-Core than OpenFisca-Web-API

openfisca/openfisca-web-api,openfisca/openfisca-web-api