Merge pull request #337 from larilampen/develop

Trivial fix for issue #336
Merge pull request #341 from adrianeboyd/develop

#332 Improving document metadata cache in document browser table
Merge pull request #340 from korpling/CorefVisualizer

fixed bug in CorefVisualizer. The annotation name is now displayed
updated licenses
updating version
updated changelog
Finish annis-3.1.7