Error(s) in re-building vignettes:
--- re-building ‘charting-data-frames.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Highcharts (www.highcharts.com) is a Highsoft software product which is
not free for commercial and Governmental use

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 52-53 (charting-data-frames.Rmd) 
Error: processing vignette 'charting-data-frames.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘charting-data-frames.Rmd’

--- re-building ‘charting-maps.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Highcharts (www.highcharts.com) is a Highsoft software product which is
not free for commercial and Governmental use
--- finished re-building ‘charting-maps.Rmd’

--- re-building ‘replicating-highcharts-demos.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 58-81 (replicating-highcharts-demos.Rmd) 
Error: processing vignette 'replicating-highcharts-demos.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘replicating-highcharts-demos.Rmd’

--- re-building ‘shiny-events-demo.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘shiny-events-demo.Rmd’

SUMMARY: processing the following files failed:
  ‘charting-data-frames.Rmd’ ‘replicating-highcharts-demos.Rmd’

Error: Vignette re-building failed.
Execution halted