Bokeh renderer now saves necessary HTML assets to file

[jlstevens]

I did the simplest thing that I could think of to address issue #1411. I'm happy to hear any suggestions on how to improve it and I just need to test on Python 2: I get nervous when I see anything relating to unicode!

%%output filename="output"
x = [1, 2, 3, 4, 5]
y = [6, 7, 2, 4, 5]
hv.Curve((x,y),label="Temp")

Now generates a self-contained HTML file:

[philippjfr]

As long as you tested this on py2 and py3 and perhaps use a plot with a unicode character in the title I'm happy to merge once tests pass.

[jlstevens]

This worked with py2 and py3:

[philippjfr]

Great, will merge once tests pass.

[github-actions]

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