Added Ransom notebooks

[tyleransom]

I've added the following 3 Jupyter notebooks:

• dataframes_examples.ipynb
• regression_models.ipynb
• jump_optimization.ipynb

I've also added a CSV file to the dependencies folder, which is required to run some of the notebooks.

[jstac]

@tyleransom Just minor comments:

Did you want to add your email address or a link to your GitHub repo to the top of the notebooks? It's up to you, of course.

Also, in cell [2] of jump_optimization (and perhaps elsewhere) you've used tabs instead of spaces. The style guide recommends spaces:

https://github.com/JuliaLang/julia/blob/master/CONTRIBUTING.md "4 spaces per indentation level, no tabs"

[tyleransom]

@jstac Thanks for pointing those out. I've updated the notebooks to include my email address, GitHub repo link, and changed indentations from tabs to 4 spaces.

[jstac]

@tyleransom Thanks, they look good.

@mmcky Would you mind to give these a very quick eyeball (I've already looked them over) and then merge if you're happy?

[jstac]

@mmcky Just a reminder to merge these when you have a moment. They look pretty good to me.

@tyleransom Sorry for the delay -- it's been a busy week.

[mmcky]

@tyleransom Sorry for holding things up. These notebooks look great. I notice the dependency file auto.csv isn't setup to download from the dependency folder on GitHub. We have a simple fetch utility on the Python side but this is not yet implemented on the Julia side. I think this is fine as you have documented how to get the data file well.

@jstac Merging this and I will push a PR for the gallery.

[tyleransom]

@jstac @mmcky Thanks!