v1.4.0 Leibniz connection

component and configurations for BEOL-Leibniz (#140)

* feature (BEOL-Leibniz) creating components for BEOL-Leibniz connection

* feature (beol-Leibniz) make the scripts returned by DOMParser executable

* feature (beol-Leibniz)
-get the json for every letter from LeibnizAPI
-parse and display the "volltext"

* fix (beol-Leibniz) render inline math wrapped in dollars

* style(correspondence): Redesign the link of Newton project

* feature (beol-leibniz) add letter number and URI to PDF

* style (beol-leibniz) redesign the link to Leibniz Briefportal

* style (beol-Leibniz) preliminary implementation for the display of uri values

* style (beol-Leibniz) align the newton and leibniz tiles in one row

* style (beol-leibniz) alignment of tiles and top margin adjusted

* style (beol-leibniz) added myself to the technical contacts

* feature (beol-leibniz) add description of the connection to the 3rd party repositories

* feature (beol-Leibniz) label of the uri values should be displayed as the inner text of link

* beol (BEOL-Leibniz) quick-dirty fix for travis to ignore the need for new Knora-ui version

* update knora-ui version

* fix (beol-Leibniz) parse missing SVG files for

* fix (beol-leibniz) remove the clone of deleted branch

* fix (beol-Leibniz) fixes issue #144

* style (beol-Leibniz) remove console logs

* update (beol-Leibniz) knora-ui version update

* fix (beol-leibniz) adapt the kui-search to new changes