Let bargap adapt and fix x-labels in category histograms

[mkcor]

This PR fixes category histograms (bar gap and x-labels).
Before: https://plot.ly/~marianne2/98
After: https://plot.ly/~marianne2/96

• Image diffs can be seen here: 89870ed
  Look for JSON changes (i.e., test-ggplot-histogram-barmodestack.json, test-ggplot-histogram-binwidth.json, test-ggplot-histogram-dates.json) and corresponding image files, as @chriddyp suggested.

I'll increment the package version number after reviews.

/cc @pedrodz

[chriddyp]

Nice! Is it possible to see how the cookbook plots changed, too?

[mkcor]

Sure! They should be fixed, because this is what I get, calling ggplotly() manually:
https://plot.ly/~marianne2/100/count-vs-day/
https://plot.ly/~marianne2/99/count-vs-day/
I'll check why these two examples didn't get updated on the add-r-cookbook-tests branch.

[mkcor]

@chriddyp Okay, I reran just the cookbook part and this is the resulting diff :)
a123b8b

[chriddyp]

looking good!

On Fri, Oct 24, 2014 at 12:37 PM, Marianne Corvellec <
notifications@github.com> wrote:

@chriddyp https://github.com/chriddyp Okay, I reran just the cookbook
part and this is the resulting diff :)
a123b8b
a123b8b

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