Removed replace prompt for uploading books with duplicate IDs
Updated version numbers
Updated version numbers
Created optimized build for web flavor of viewer
Merge remote-tracking branch 'origin/develop' into feature/keyboard

Conflicts:
	readium-js
Merge remote-tracking branch 'origin/release/0.13' into feature/keyboard

Conflicts:
	templates/library-item.html
missing data attr (merged from Ryan's fix)