Fixes #185
Regression: keyboard shortcuts fail when focus is within content iframe (cloud reader only, not chrome app)
pre-built Readium.js
restored correct iframe loader for cloud reader (was testing for issue #185)
submodule
submodule
Merge branch 'develop' of https://github.com/readium/readium-js-viewer into develop

Conflicts:
	readium-js
submodule
Updated human-readable version to 0.15.1, i.e. 2.15.1
submodule
submodule
submodule update
added TODO comment for #188, updated submodule
Merge branch 'develop' of github.com:readium/readium-js-viewer into develop
submodule
Submodule
Fixes #184 adds the title attribute back to the fullscreen button
submodule
Merge branch 'develop' of https://github.com/readium/readium-js-viewer into develop