Merge pull request #35 from readium/develop

Develop
Merge remote-tracking branch 'origin/develop' into release/0.13
Merge branch 'develop' into release/0.13
Merge branch 'develop' into release/0.13
Merge branch 'develop' into release/0.13
Fix Bug 50 - same document hush links didn't work properly
merge
Merge commit '52ce5c34e58b73' into release/0.13
Fixes keyboard nav regression
Merge remote-tracking branch 'origin/release/0.13' into develop
Created optimized build for web flavor of viewer