title: How to set Bokeh legend font?
body: <p><em>EDIT: Please note the syntax of the example code below is out of date, from a very early version of Bokeh.</em></p>
  
  <hr>
  
  <p>How to define the font used for labeling everything? I only figured out how to change the font of the title, the markes and the axis, but how do I change the font of the legend?</p>
  
  <p>Here is a running example for testing the changes.</p>
  
  <pre><code>from bokeh.plotting import *
  from bokeh.sampledata import periodic_table
  import pandas as pd
  
  elements = periodic_table.elements
  elements = elements[elements['atomic number'] &lt;= 82]
  elements = elements[~pd.isnull(elements['melting point'])]
  mass = [float(x.strip('[]')) for x in elements['atomic mass']]
  elements['atomic mass'] = mass
  
  palette = list(reversed([
      '#67001f','#b2182b','#d6604d','#f4a582','#fddbc7','#f7f7f7','#d1e5f0','#92c5de','#4393c3','#2166ac','#053061'
  ]))
  
  melting_points = elements['melting point']
  low = min(melting_points)
  high= max(melting_points)
  melting_point_inds = [int(10*(x-low)/(high-low)) for x in melting_points] #gives items in colors a value from 0-10
  meltingpointcolors = [palette[i] for i in melting_point_inds]
  
  output_file("elements.html", title="elements.py example")
  
  hold()
  
  circle(elements['atomic mass'], elements['density'] ,
         color=meltingpointcolors, plot_width=1200, line_color='black',fill_alpha=0.8,
         size=12, title='Density vs Atomic Weight of Elements (colored by melting point)', legend="circle",
         title_text_font="times", background_fill= '#cccccc', tools='pan, wheel_zoom, box_zoom, reset')
  
  text(elements['atomic mass'], elements['density'] +0.3,
      text=elements['symbol'],angle=0, text_color='#333333',
      text_align="center", text_font_size="10pt", text_font="times")
  
  xaxis().axis_label='atomic weight (amu)'
  yaxis().axis_label='density (g/cm^3)'
  grid().grid_line_color='white'
  axis().axis_label_text_font="times"
  show()
  </code></pre>