vignette warning
@lmcneill - not sure what causes this one?
checking files in ‘vignettes’ ... WARNING Files in the 'vignettes' directory but no files in 'inst/doc': ‘synapsis_tutorial.Rmd’, ‘synapsis_tutorial_fast.Rmd’, ‘synapsis_tutorial_fast.html’, ‘using_synapsis.Rmd’, ‘using_synapsis.html’, ‘using_synapsis_example.html’, ‘using_synapsis_test.Rmd’ Package has no Sweave vignette sources and no VignetteBuilder field.