fix XSS when importing articles, speed up update and adding of feeds by only purifying content that will be added to the db
fix XSS when importing articles, speed up update and adding of feeds by only purifying content that will be added to the db

Xefir/news,itstar4tech/news,IBBoard/news,owncloud/news,itstar4tech/news,owncloud/news,IBBoard/news,IBBoard/news,David-Development/news,IBBoard/news,itstar4tech/news,David-Development/news,Xefir/news,itstar4tech/news,Xefir/news,David-Development/news,David-Development/news,owncloud/news,Xefir/news