Add custom build of highlightjs
Collect persisters with output fn in saver
Add output fn to TreebankPersister
Start with outputter directive
Add outputter to navbar buttons
Add scss for a large modal
Add an XML formatting function to arethusaUtil
Make highlight css files importable for scss
Fix scss for outputter modal
Allow to xml in TreebankPersister.output()
Add angular-highlightjs directive
Update outputter directive
Update arethusaUtil.formatXml()

Write empty nodes as one liners. `<word/>` instead of `<word>\n</word>`
Fix font-weight of highlightjs code
Update scss for outputter
Make outputter directive functional
Update and fix i18n for outputter
Provide more info in TreebankPersister
Enable download button in outputter
Update and refactor outputter