View stats per release, we do this by
doing log diffs between release tags. Ex: `git log
boost-1.78.0..boost-1.79.0`. The output is parsed and the commits
are saved with a foreign key to the `LibraryVersion` it relates to.
- commits are imported by doing "bare" clones (no project files, only
git data) of repos into temporary directories, as created by python's
bulitin `tempfile.TemporaryDirectory`
- Added Commit model
- Added CommitAuthor model
- Added CommitAuthorEmail model
- One CommitAuthor can have many emails.
- Added task for importing commits. (and admin link to trigger it)
- Added task for importing CommitAuthor github data (avatar and profile
url, with admin link to trigger it)
- Added a basic Library stat page which can be viewed by going to the
admin -> library -> view stats.
- Added a `Get Release Report` button in the `LibraryAdmin` which allows
a staff member to select a boost version and up to 8 libraries to
generate a report for. The report is just a webpage which attempts to
convert cleanly to a pdf using the browser's print to pdf functionality.
- Updated the Library Detail page to show commits per release instead of
per month.
- Updated the Library Detail page to show `Maintainers & Contributors`
sorted by maintainers, then the top contributors for the selected
release, then the top contributors overall by commits descending.
- Removed CommitData, which was tracking monthly commit stats
