Log Message:
Changes 1.8.4:
* Cygwin port has been updated for more recent Cygwin 1.7.
* "git rebase -i" now honors --strategy and -X options.
* Git-gui has been updated to its 0.18.0 version.
* MediaWiki remote helper (in contrib/) has been updated to use the
  credential helper interface from Git.pm.
* Update build for Cygwin 1.[57].  Torsten Bögershausen reports that
  this is fine with Cygwin 1.7 ($gmane/225824) so let's try moving it
  ahead.
* The credential helper to talk to keychain on OS X (in contrib/) has
  been updated to kick in not just when talking http/https but also
  imap(s) and smtp.
* Remote transport helper has been updated to report errors and
  maintain ref hierarchy used to keep track of its own state better.
* With "export" remote-helper protocol, (1) a push that tries to
  update a remote ref whose name is different from the pushing side
  does not work yet, and (2) the helper may not know how to do
  --dry-run; these problematic cases are disabled for now.
* git-remote-hg/bzr (in contrib/) updates.
* git-remote-mw (in contrib/) hints users to check the certificate,
  when https:// connection failed.
* git-remote-mw (in contrib/) adds a command to allow previewing the
  contents locally before pushing it out, when working with a
  MediaWiki remote.
Find more https://raw.github.com/git/git/master/Documentation/RelNotes/1.8.4.txt