basic support for loading web-fonts
allow visualizers to adopt to the globally selected font

GridVisualizer e.g. just adds the "global-font" class to it's styles
Merge master

Conflicts:
	annis-gui/src/main/java/annis/gui/resultview/ResultSetPanel.java
	annis-gui/src/main/java/annis/gui/resultview/ResultViewPanel.java
	annis-gui/src/main/java/annis/gui/resultview/SingleResultPanel.java
	annis-gui/src/main/java/annis/gui/resultview/VisualizerPanel.java
	annis-libgui/src/main/java/annis/libgui/visualizers/VisualizerInput.java
	annis-widgets/pom.xml
coref now supports now webfonts
Merge branch 'refs/heads/master' into webfonts
Merge branch 'refs/heads/master' into webfonts
allow to show virtual keyboard and some cleanup
better placement of the keyboard button and no auto-show on click
inform server when language changed and remember choice
allow to configure keyboard layout per instance
use ISO code for language attribute
apply selected instance font on virtual keyboard
no custom font for grid header
allow web-fonts in VakyarthaDependencyTree visualizer
use serif font for dependency labels
Merge pull request #90 from thomaskrause/webfonts

allow administrator-defined embedded fonts