Better font rendering for collabdoc previews
Added license header to Etherpad CSS file
Ensuring bad html can’t trigger an error
Resetting the server internal address during tests

This allows us to run tests on vagrant machines.
Merge branch 'pp-collabdocs' of https://github.com/simong/Hilary into pp-collabdocs

Conflicts:
	node_modules/oae-preview-processor/lib/processors/collabdoc/collabdoc.js