add a new tab for embedded previews with google books functionality
Link Google preview to thumbnail.
Merge branch 'release-2.3'
Added grid as default mode to prevent PHP warnings in Cover Generator.
Google Preview fix for Bootstrap 2.
Fixed bug: duplicate entries in "recently received" list.
Merge branch 'release-2.3'
Fix Recaptcha error in Lightbox and move advanced title functionality over from Bootstrap 3.
Merge branch 'release-2.3'
Search box styling.
Merge branch 'release-2.3'
Fixed typo.
Fix over-zealous Google Preview linking.
Merge branch 'release-2.3'