Merge branch 'master' of git://git.kernel.org/pub/scm/git/git

Merge branch 'master' of git://git./git/git

* 'master' of git://git.kernel.org/pub/scm/git/git: (36 commits)
  fsck-objects: refactor checking for connectivity
  git-gc: do not run git-prune by default.
  shallow repository: disable unsupported operations for now.
  is_repository_shallow(): prototype fix.
  Make sure git_connect() always give two file descriptors.
  Revert "prune: --grace=time"
  Documentation/tutorial-2: Fix interesting typo in an example.
  GIT v1.5.0-rc2
  prune: --grace=time
  --walk-reflogs: do not crash with cyclic reflog ancestry
  --walk-reflogs: actually find the right commit by date.
  Fix --walk-reflog with --pretty=oneline
  reflog-walk: build fixes
  log --walk-reflog: documentation
  --walk-reflogs: disallow uninteresting commits
  Teach the revision walker to walk by reflogs with --walk-reflogs
  git-rebase: allow rebasing a detached HEAD.
  branch -f: no reason to forbid updating the current branch in a bare repo.
  git-tag -d: allow deleting multiple tags at once.
  Do not verify filenames in a bare repository
  ...