Include German stanford dep-parser model for medical domain

[zesch]

Available here:
http://macss.dfki.de/data/dependency_parser/UD_German_Clinical_retrain_250_0.gz

[reckart]

@zesch Can you provide any more info on this model, e.g. a website where it is described in more detail?

[zesch]

http://macss.dfki.de/dependency_parser.html

The work was presented at KONVENS in Vienna.