purl() also evaluates read_chunk(); fixed #175
purl() also evaluates read_chunk(); fixed #175

fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,antass/labnotebook3,antass/labnotebook3,fboehm/labnotebook