tests: make webdriver errors stand out more from travis-ci logs (e.g. https://travis-ci.org/openwhyd/openwhyd/builds/416352392#L2166)
tests: make webdriver errors stand out more from travis-ci logs
(e.g. https://travis-ci.org/openwhyd/openwhyd/builds/416352392#L2166)

openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd,openwhyd/openwhyd