Merge branch 'js/shortlog'

* js/shortlog:
  git-shortlog: make common repository prefix configurable with .mailmap
  git-shortlog: fix common repository prefix abbreviation.
  builtin git-shortlog is broken
  shortlog: fix "-n"
  shortlog: handle email addresses case-insensitively
  shortlog: read mailmap from ./.mailmap again
  shortlog: do not crash on parsing "[PATCH"
  Build in shortlog

diff --cc Makefile
Simple merge