CRAN submission

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CRAN version v4.8.0

Also, clean up examples on help(add_trace)

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Merge pull request plotly#728 from nielsenmarkus11/nielsenmarkus11-pa…

…tch-1

Add `source` argument to both the source plot and `event_data` function

Merge pull request plotly#586 from ropensci/update/plotlyjs-1.11.0

update to plotly 1.11.0

documentation changes for R CMD check

Merge pull request plotly#574 from ropensci/fix/axis-labels

use Plotly axis titles if not facetted

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