split appliance application condition into apply? method as suggested by @banzaiman
split appliance application condition into apply? method as suggested by @banzaiman

kevmoo/travis-build,andyli/travis-build,JuliaCI/travis-build,kevmoo/travis-build,craigcitro/travis-build,craigcitro/travis-build,andyli/travis-build,JuliaCI/travis-build