Log Message:
Changes 1.8.0:
UI, Workflows & Features
 * A credential helper for Win32 to allow access to the keychain of
   the logged-in user has been added.
 * An initial port to HP NonStop.
 * A credential helper to allow access to the Gnome keyring has been
   added.
 * When "git am" sanitizes the "Subject:" line, we strip the \ 
prefix from
   "Re: subject" and also from a less common "re: subject", \ 
but left
   the even less common "RE: subject" intact.  Now we strip that too.
 * It was tempting to say "git branch --set-upstream origin/master",
   but that tells Git to arrange the local branch "origin/master" to
   integrate with the currently checked out branch, which is highly
   unlikely what the user meant.  The option is deprecated; use the
   new "--set-upstream-to" (with a short-and-sweet "-u") option
   instead.
 * "git cherry-pick" learned the "--allow-empty-message" \ 
option to
   allow it to replay a commit without any log message.
 * After "git cherry-pick -s" gave control back to the user asking
   help to resolve conflicts, concluding "git commit" used to need to
   be run with "-s" if the user wants to sign it off; now the command
   leaves the sign-off line in the log template.
 * "git daemon" learned the "--access-hook" option to allow an
   external command to decline service based on the client address,
   repository path, etc.
 * "git difftool --dir-diff" learned to use symbolic links to prepare
   a temporary copy of the working tree when available.
 * "git grep" learned to use a non-standard pattern type by default if
   a configuration variable tells it to.
 * Accumulated updates to "git gui" has been merged.
 * "git log -g" learned the "--grep-reflog=<pattern>" \ 
option to limit
   its output to commits with a reflog message that matches the given
   pattern.
 * "git merge-base" learned the "--is-ancestor A B" option \ 
to tell if A is
   an ancestor of B.  The result is indicated by its exit status code.
 * "git mergetool" now allows users to override the actual command used
   with the mergetool.$name.cmd configuration variable even for built-in
   mergetool backends.
 * "git rebase -i" learned the "--edit-todo" option to open \ 
an editor
   to edit the instruction sheet.