Bazga merge
Created by: bwbohl
- adds Docker based automatic build on pullrequests
- mardown improvement in README
- introduces index.xql with CSS injection options
- adds no-break spaces to lang file de
- adds missing lang keys to en
- only show priority and category label in annotation meta if at least one value is present
- adds localization of categories and priorities
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- fixes annotation previews
- adds XQDoc to annotation.xqm and edition.xqm
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- introduces source:isSource function
- adds annotationIcons to openseadragonView
- some indentation