replace refresh icon
document browser icon and info icon replaced
also replace info icon in other places
query icon and example query representation updated
help/examples and login updated
some more sizing experiments
Merge remote-tracking branch 'tk/feature/fontawesome' into feature/valo

Conflicts:
	annis-gui/src/main/java/annis/gui/MainToolbar.java
	annis-gui/src/main/webapp/VAADIN/themes/annis/annis.scss
	annis-gui/src/main/webapp/VAADIN/themes/annis/styles.css
use our own font icon theme