title: Interactive Plots in Jupyter notebook not shown on Github
body: <p>I have Interactive Plots in Jupyter notebook but those plots are not shown on Github once I upload my notebook to Github, any suggestions around it?
  I even save notebook's widget state. Below is a sample interactive python plot if you want to try:</p>
  
  <pre><code>from IPython.html.widgets import *
  import numpy as np
  import matplotlib.pyplot as plt
  import ipywidgets as wg
  from IPython.display import display 
  from numpy import pi
  
  
  def pltFunc(f):
  
      plt.figure(figsize=(15,8))
      x = np.arange(0,2*pi,0.01)
      y1 = np.sin(2*np.pi*x*f)
      y2 = np.cos(2*np.pi*x*g) + np.sin(np.pi*x*g)
  
      plt.subplot(221)
      plt.text(3, 2, r'$f(t) = \sin(2\pi \times$' + str((f)) +  't)' , 
                               {'color': 'b', 'fontsize': 16, 'ha': 'center', 'va': 'center',})
      plt.plot(x, y1, 'b', linewidth=2)
      plt.title('Sine Signal - change f')
      plt.xlabel('t', {'color': 'k', 'fontsize': 20})
      plt.ylabel('f(t)', {'color': 'k', 'fontsize': 20})
      plt.ylim([-2.5,2.5])
      plt.xlim([0,2*pi])
      plt.xticks((0, pi, 2*pi), ('$0$','$\pi$','$2\pi$'), color='k', size=20)
      plt.yticks((-2, 0, 2), ('-2','$0$','+2'), color='k', size=20)
      plt.show()
  
  
  
  
  f_slide = wg.FloatSlider(value=1.5,min=0,max=3,step=0.1)
  interact(pltFunc, f = f_slide)
  </code></pre>
  
  <p>Even they don't show up if you download the notebook as pdf as latex</p>