These parameters are defined in the PHPDocs for `Report` and are technically part of the method signature. They should be respected and in the case of the new default limit in silverstripe/silverstripe-reports#139 this could have performance ramifications for large datasets.
* Update existing test for review button field name, remove obsolete save review test
* Move test classes to tests/php to differentiate from behat
* Add behat build to Travis configuration
