Merge remote-tracking branch 'arvid/master'
Merge branch 'master' of https://github.com/fatschi/sopremo-cleansing
fixed some bugs in IllegalCharacterRule + Fix (TextNode.valueOf("") returns constant TextNode, so appending to that is not possible because of side effects), implemented testcases for IllegalCharacterRule, scrubbing-operator now supports functioncalls in addition to the normal rulebased behavior
ignored some tests, added new integration test and test data