Merge pull request #35 from readium/develop

Develop
Handle toc resizing a little better
Merge branch 'develop' of https://github.com/readium/readium-js-viewer into develop
submodule update
Merge branch 'develop' of github.com:readium/readium-js-viewer into develop
build update + submodule ref
minor CSS tweak to Media Overlays highlight styles + updated build / submodule reference
Media Overlays UI for synchronisation granularity
MO check
MO UI for sync granularity
fixed minor UI refresh (potential) out-of-sync bug (with fixed layout two page spread)
sorted-out the CSS of the MO advanced controls panel
added missing i18n string
french typo
submodule + build
fixed a11y issues: arrow keys conflicts between page navigation and toolbar actions (e.g. slider range), keyboard focus highlight + restore on toggle buttons (does not affect mouse click), toolbar hide-out timeout disabled when mouse over or keyboard focus
minor addition to keyboard handler code (no functionality change)
fixed a11y issues with radio input (keyboard navigation + selection), enabled screen reader navigation to Media Overlays highlight colors
VoiceOver testing with Chrome and Safari (OSX), radio buttons improvments.
ah, Chrome extension index.html now in sync with cloud reader