Remove Oracle JDK7 from Travis build as no longer supported. Add workaround for Gradle wrapper download problem.
Remove Oracle JDK7 from Travis build as no longer supported. Add workaround for Gradle wrapper download problem.

tricker/wiremock,Mahoney/wiremock,dlaha21/wiremock,dlaha21/wiremock,tomakehurst/wiremock,dlaha21/wiremock,tricker/wiremock,Mahoney/wiremock,tomakehurst/wiremock,tricker/wiremock,dlaha21/wiremock,tomakehurst/wiremock,Mahoney/wiremock,Mahoney/wiremock,tricker/wiremock,tomakehurst/wiremock,tricker/wiremock,dlaha21/wiremock,tomakehurst/wiremock,Mahoney/wiremock