title: how to change grid size using facet-grid in seabron
body: <p>I'm plotting facet grid so that my x-axis ticks are dates (dd-mm-yy) and it doesn't look so good. Is there a way to change the size of the grid (like figsize)?</p>
  
  <pre><code>g = sns.FacetGrid(c53_grid, col='question',col_wrap = 4, 
  margin_titles=True)
  g = g.map(plt.plot, "submitted_at", "int_value_0")
  g = g.map(plot_mean, 'int_value_0', ls=":", c=".5")
  g.set_titles("{col_name}")
  g.set_xticklabels(rotation = 45)
  </code></pre>