Changes to support version reporting
submodule update
Submodule update with @larsvoigt's work
Merge pull request #70 from readium/feature/prev-next-button-visibility-lars

Submodule update with @larsvoigt's work
Submodule update
fixes
https://github.com/readium/readium-js-viewer/issues/185
(iframe events forward)
fixed #71
https://github.com/readium/readium-js/issues/71
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submodule update
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Merge remote-tracking branch 'origin/develop' into feature/resource-cache-invalidation
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Merge remote-tracking branch 'origin/develop' into feature/resource-cache-invalidation
Implementation of LRU automatic cache eviction policy.