Adding LCViz tutorial notebook

[rosteen]

Basic example of using LCViz with data retrieval from S3. Apparently the data retrieval, which works locally for me, doesn't actually work on TIKE, so this will need a little debugging.

[ttdu]

after running .flatten in the code cell, the plot looks strange:

bizarrely, if I open the "flatten" option in the side menu, the points re-appear:

[kecnry]

This is a known bug that we are trying to get fixed upstream in bqplot. If we can't get that in in time, perhaps we should disable normalization in the notebook?

[rosteen]

As Kyle said, this is an upstream bug that I'm hoping gets resolved in the next week or two (i.e., before this notebook would be merged). I should have mentioned it when I opened this PR - if for some reason it's not fixed by the end of November I'll remove that section.

[rosteen]

I added a note about the display bug and an edit to avoid it (by not normalizing the flattened curve), as well as one fix that I think was needed due to the new Astropy release.

[kecnry]

lcviz 1.0 is now released and available from pip

[ttdu]

last thing and then I'll merge: we use a literature reference for the period, we should link to it in the notebook. It's not clear to me which of the three papers on HAT-P-11 authored by Brett in 2017 is the correct one

[kecnry]

@bmorris3 - any preference?

[bmorris3]

haha @ttdu, I still won't shut up about that star. It's this one: https://ui.adsabs.harvard.edu/abs/2017ApJ...846...99M/abstract

[rosteen]

FYI the upstream bug with displaying the flattened light curve was fixed, so I removed the workaround.