title: How to change the position of plotly figures using ggplotly
body: <p>I am trying to remove the legend title using ggplotly without success. I'm sure there is an easy fix, but I cannot find the documentation for it - and removing the legend title (or changing the positioning) using ggplot fails to work. See e.g.:</p>
  
  <pre><code># Creating the ggplot:
  a &lt;- ggplot(mtcars, aes(x = interaction(cyl, carb, lex.order = T), 
  y = mpg,fill = interaction(cyl, carb, lex.order = T))) + 
        geom_boxplot() + theme(legend.title=element_blank())
      a # No Legend Title
      # plotly puts back the legend title
      ggplotly(a)
  </code></pre>
  
  <p>Any ideas how to change / remove the title of the graph? Should it be done using ggplotly or ggplot?</p>