address vignette issue on CRAN

Author: cboettig

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: rdflib
 Title: Tools to Manipulate and Query Semantic Data
-Version: 0.2.8
+Version: 0.2.9
 Authors@R: c(person("Carl", "Boettiger", 
                   email = "[email protected]", 
                   role = c("aut", "cre", "cph"),

NEWS.md

@@ -1,3 +1,8 @@
+# rdflib 0.2.9
+
+* Address CRAN vignette building.
+
+
 # rdflib 0.2.8
 
 * tests fail gracefully on CRAN without internet resources

vignettes/rdf_intro.Rmd

@@ -14,7 +14,7 @@ vignette: >
 ```{r include=FALSE}
 options(rdf_print_format = "nquads")
 is_linux <- Sys.info()["sysname"] == "Linux"
-knitr::opts_chunk$set(eval=is_linux)
+knitr::opts_chunk$set(eval=FALSE)
 ```
 
 In the world of data science, RDF is a bit of an ugly duckling.  Like XML and Java, only without the massive-adoption-that-refuses-to-die part.  In fact RDF is most frequently expressed in XML, and RDF tools are written in Java, which help give RDF has the aesthetics of *steampunk*, of some technology for some futuristic Semantic Web[^1] in a toolset that feels about as lightweight and modern as iron dreadnought.