Travis CI failed to update the submodule, trying to figure out why: https://travis-ci.org/readium/readium-js-viewer/jobs/75156951#L86
Travis CI failed to update the submodule, trying to figure out why: https://travis-ci.org/readium/readium-js-viewer/jobs/75156951#L86

NYULibraries/readium-js-viewer,NYULibraries/readium-js-viewer,GermanCentralLibraryForTheBlind/readium-js-viewer,looknear/readium-js-viewer,readium/readium-js-viewer,AndyHubert/readium-js-viewer,kivuto/readium-js-viewer,AndyHubert/readium-js-viewer,readium/readium-js-viewer,GermanCentralLibraryForTheBlind/readium-js-viewer,looknear/readium-js-viewer,kivuto/readium-js-viewer