Vincent graph won't display in Python 2.7

Question

I have Anaconda with Python 2.7 and am trying to use Vincent. I did pip install and that seemed to work. I tried to run it in Spyder and separately in iPython, but neither seemed to work. I tried this in iPython:

import vincent
import pandas as pd
vincent.core.initialize_notebook()
X= [
 [0,0,1,1,1,0],
 [1,1,0,0,0,1],
 [1,0,0,0,1,1],
 [0,1,1,0,0,0],
 [0,0,0,1,0,0],
 [0,0,1,1,1,0],
 [1,1,0,0,0,1]
 ]
x1 = pd.DataFrame(X)
line = vincent.Line(x1)
line.display()

I got the following error:

Javascript error adding output!
TypeError: Object doesn't support this action
See your browser Javascript console for more details.

I then tried running it in Spyder. It created the line object, but didn't display anything. When I type

type(line)

I get

<class 'vincent.charts.Line'>

Which is good, but I want to show the line! Am I missing a dependency, or is my syntax off?