Finish annis-3.1.4
change version number to 3.1.5
fix #321 (negated metadata queries don't work any longer)
updated changelog
do not create the visualizer for the docbrowser in the background process but in the vaadin UI lock context (this should fix #323)
updated changelog
fix #322: Invalid regex search error is not caught by interface
updated changelog
Finish annis-3.1.5

Conflicts:
	Misc/changelog.py
	annis-gui/pom.xml
	annis-interfaces/pom.xml
	annis-kickstarter/pom.xml
	annis-libgui/pom.xml
	annis-service/pom.xml
	annis-service/src/test/java/annis/CountTest.java
	annis-visualizers/pom.xml
	annis-widgets/pom.xml
	buildbot_scripts/copyService.sh
	doc/Doxyfile
	pom.xml