git_prov: Access git provenance information
In oharac/provRmd: Track Provenance Within R Markdown scripts

This function takes a filename and reads its git log, strips to its most recent commit, and appends it to the provenance tracking dataframe. If a prov log exists (and nolog is FALSE), this information is added to the log.

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git_prov(filename, filetype = c("input", "output", "parent_script",
  "sourced_script", "plot")[1], nogit = FALSE, nolog = FALSE,
  not_tracked = FALSE)

`filename`	A valid file name (relative or absolute) or vector of file names
`filetype`	The role of this file within this context: 'input', 'output', 'parent_script', 'sourced_script', or 'plot'. Defaults to 'input'.
`nogit`	Should this file be skipped for git provenance purposes? Defaults to FALSE.
`nolog`	Should this git provenance information be omitted from the log file? Defaults to FALSE.
`not_tracked`	Files used in a script but not tracked in Git can be identified by a non-response from a `git log` command; however, for files known to be not tracked in this repo (e.g. on a remote server or in a different repository) it may be desirable to simply skip the `git log` and mark it right away as not tracked, while still including it in the prov log and workflow, etc. Defaults to FALSE.

git_prov('raw_data.csv', filetype = 'input')
git_prov('raw_data.csv', filetype = 'input', nogit = TRUE)
  ### will skip provenance tracking for this file
git_prov('raw_data.csv', filetype = 'input', nolog = TRUE)
  ### will gather git commit info for this file, but will not add to the
  ### git tracking data frame.  This can be useful if you just want to
  ### peek at the commit info.