background color can be any valid R color now; fixed #43 (thanks, Ramnath Vaidyanathan)
background color can be any valid R color now; fixed #43 (thanks, Ramnath Vaidyanathan)

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