move more vignettes/ files to rmd, tweak Makefile

Author: eddelbuettel

vignettes/.install_extras vignettes/pdf/.install_extrasvignettes/.install_extras renamed to vignettes/pdf/.install_extras

@@ -6,6 +6,7 @@ rmdvignettes := 	$(rmdsources:.Rmd=.pdf)
 %.pdf:			%.Rmd
 			Rscript -e 'rmarkdown::render("$<")'
 			Rscript -e 'tools::compactPDF("$@", gs_quality="ebook")'
+			cp -vax $@ ../pdf
 
 all:			${rmdvignettes} Rcpp-jss-2011.pdf