a Makefile to build the vignette using knitr; closes #97
a Makefile to build the vignette using knitr; closes #97

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