Fix latex formatting in notebooks

[napsternxg]

Closes #585

[dustinvtran]

Thanks! This looks great. It's nice that the fix is as simple as adding line breaks.

Some comments:

• The equation/align environments in gan.ipynb are still broken.
• The equation/align environments in unsupervised.ipynb are still broken.
• The <img src=...> lines in gan.ipynb aren't rendering. It seems like Markdown's syntax for displaying images will also work for displaying them in the Github/Jupyter notebook viewers.
• the

``text''

lines were accidentally carried over when transferring text from their corresponding tex file. Can you change them all to be "text"?

• In linear_mixed_effects_models.ipynb, can you replace \citep{gelman2006data} with (Gelman & Hill, 2006)?
• Empty cell accidentally added to unsupervised.ipynb.

[napsternxg]

@dustinvtran added the suggested fixes.

[dustinvtran]

Thanks again. Additional comments:

• The equation/align environments in gan.ipynb are still broken.
• The equation/align environments in unsupervised.ipynb are still broken.
• Empty cell accidentally added to bottom of gan.ipynb.
• Empty cell accidentally added to bottom of unsupervised.ipynb .
• You used various forms of italics and bolds to replace the ``text'' lines. Why not "text" (i.e., wrapping the phrases with literal quotation marks)? The latter remains consistent with the rendering on the tutorial webpages.
• Upon closer look, it seems like you use $$ to separate the equation/align environments and properly render them. What if you just add blanklines instead? Does that not render correctly?

[napsternxg]

@dustinvtran This should be good.

[dustinvtran]

LGTM. Thanks again.