fix webfinger for (old?) nokogiri syntax
fix webfinger for (old?) nokogiri syntax

geraspora/diaspora,diaspora/diaspora,Flaburgan/diaspora,despora/diaspora,Muhannes/diaspora,SuperTux88/diaspora,Flaburgan/diaspora,KentShikama/diaspora,spixi/diaspora,jhass/diaspora,jhass/diaspora,Flaburgan/diaspora,KentShikama/diaspora,despora/diaspora,SuperTux88/diaspora,KentShikama/diaspora,despora/diaspora,SuperTux88/diaspora,Muhannes/diaspora,Muhannes/diaspora,Amadren/diaspora,SuperTux88/diaspora,despora/diaspora,diaspora/diaspora,jhass/diaspora,diaspora/diaspora,geraspora/diaspora,geraspora/diaspora,diaspora/diaspora,spixi/diaspora,Amadren/diaspora,Flaburgan/diaspora,Muhannes/diaspora,KentShikama/diaspora,geraspora/diaspora,jhass/diaspora,spixi/diaspora,spixi/diaspora,Amadren/diaspora,Amadren/diaspora