title: title in italic font in matplotlib isn't working
body: <pre><code>import matplotlib.pyplot as plt
  from textwrap import wrap
  
  x_list = [11, 3, 6, 5]
  label_list = ["red colour", "blue colour", "green colour", "back colour"]
  
  title = "Some really really long long long title I really really need - and just can't - just can't - make it any - simply any - shorter - at all?"
  
  newtitle = '\n'.join(wrap(title, width=50))  # wrap the long title so that it won't get cropped.
  
  # here if I print `newtitle` first then "text below the main title" gets convert into italics
  newtitle = "%s\n$%s$"%(newtitle, 'text\ below\ the\ main\ title') 
  # but If I print `newtitle` after the secondary text it doesn't convert into italics
  newtitle = "%s\n$%s$"%('text\ below\ the\ main\ title', newtitle)  # comment this line for 1st effect
  
  plt.figure(figsize=(7,6), dpi=100)
  plt.axis("equal")
  plt.subplots_adjust(left=0.1, right=0.8, top=0.7)
  plt.rc("font", size=10)
  explode = [0.03, 0, 0, 0]
  
  plt.pie(x_list, labels=label_list, explode=explode, autopct="%1.1f%%", startangle=90)
  plt.title(newtitle, size=12)
  
  plt.savefig('test.png')
  </code></pre>
  
  <p>So my main problem is - </p>
  
  <p>secondary text come first in normal font and then main title(<code>newtitle</code>) come after this  in italics/light font (looks pretty).</p>
  
  <p><code>newtitle = "%s\n$%s$"%('text\ below\ the\ main\ title', newtitle)</code></p>
  
  <p>Can we do it without using <code>$</code> sign?</p>