Version 4.2.9

Date: 22-Jan-2016

• (enh #545): Refactor code to deep extend options correctly.
• (enh #541): Improve default slug callback to accept most characters.
• (enh #534, enh #535): Ability to remove errored file thumbnails via removeFromPreviewOnError.
• (enh #531): Enhance/Fix typos of Arabic translation.
• (enh #530): Error alert box and preview thumbnail styling enhancements.
• (enh #523): Add new branch sass for bootstrap-sass-official support.
• (enh #521): Update Dutch Translations.
• (enh #489): Update documentation for change and fileselect events.