fixes
https://github.com/readium/readium-js-viewer/issues/185
(iframe events forward)
fixed #71
https://github.com/readium/readium-js/issues/71
submodule
Merge branch 'develop' of https://github.com/readium/readium-js into develop
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submodule update
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Merge branch 'develop' of https://github.com/readium/readium-js into develop