Removed mathjax timeout because of the potential to break pagination.
Resource cache invalidation.

This commit secures proper revocation of object URLs created for the
publication fetcher's resource cache.

It also introduces a change to retain original Blob references in the cache.

The rationale is to prevent IE from invalidating object URLs on garbage
collection.
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
submodule
submodule
submodule
submodule
submodule update
submodule
submodule
Merge remote-tracking branch 'origin/develop' into feature/resource-cache-invalidation
submodule
Merge remote-tracking branch 'origin/develop' into feature/resource-cache-invalidation
Implementation of LRU automatic cache eviction policy.