Allow contents of unknown tags in.
Allow contents of unknown tags in.

Clean functions were removing contents of any unknown tag. This was, it turned
out, a bit too strict.

nsartor/Squire,lzhengms/Squire,lzhengms/Squire,InteractiveIntelligence/Squire,StileEducation/Squire,InteractiveIntelligence/Squire,natejenkins/squire,ProtonMail/Squire,gertsonderby/Squire,xfra35/Squire,StileEducation/Squire,yuhange/Squire,xfra35/Squire,xiamidaxia/Squire,natejenkins/squire,Endika/Squire,yuhange/Squire,neilj/Squire,nsartor/Squire,neilj/Squire,Endika/Squire,ProtonMail/Squire,gertsonderby/Squire,xiamidaxia/Squire