Analyze GitHub issues and pull requests

Will be based on:

https://github.com/jennybc/analyze-github-stuff-with-r#readme

Overview:

• Three examples of working with data from the GitHub API
  • API sends JSON but gets converted to R list by the gh package
• Issues for one user
  • tabulate open issue by repository
  • map() is used to iterate over repo
• Pull requests on a repository
  • analyze pull requests against the books R Packages and Advanced R
  • Are there more PRs for earlier chapters? Do people lose their enthusiasm for reading/correcting later in the book?
  • map_*() functions used to create data frame from nested list
  • map() to iterate over PRs and get affected files from the diff
  • unnest() to go from one row per PR to one row per file modified in a PR
• Issues threads on a repository
  • analyze class participation in the STAT 545 Discussion board
  • map_*() functions used to create data frame from nested list
  • map() to iterate over issues and retrieve follow up comments
  • walk()
  • unnest() to go from one row per issue to one row per comment on an issue

Several clean scripts are there, as well as expository README.