Fix regression in curve-fitting notebook

[frreiss]

This PR primarily addresses issue #37, a regression in fit_us_data.ipynb that caused the notebook to crash. The problem was caused by a regression fix in an upstream library that resulted in a Python object for a tensor having an unexpected type. I've added explicit type conversions in two places in the notebook, and now the notebook runs.

I'm also including some general light updating of the code that I did while reproducing the issue from #37:

• Regenerate notebook outputs with today's data
• Update pipeline file to latest file format
• Exclude temporary files generated by recent builds of Elyra/JupyterLab from git
• Fix linter warnings produced by recent builds of the Elyra linter integration

[review-notebook-app[bot]]

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