Mirador 2.1.3 - Annotation, Bug fixes, and Compatibility Improvements

• Links in annotation bodies open in a new (blank) tab
• Canvas thumbnails at level 0 are explicitly checked
• Metadata display improvements
• Update paper.js to be compatible with latest version of Chrome
• Correct the annotation modelling for openAnnotation annotations (#1138)
• Updates to locale files and localisation improvements
• Basic support for "members" property for Presentation API version 2.1
• Account for arrays of annotations in saving and modelling