Merge branch 'master' into next

Merge branch 'master' into next

* master:
  Add git-quiltimport to .gitignore.
  cvsimport: introduce _fetchfile() method and used a 1M buffer to read()
  cvsimport: cleanup commit function
  cvsimport: use git-update-index --index-info
  git status: skip empty directories, and add -u to show all untracked files
  cvsimport: repack every kilo-commits.
  cvsimport: introduce -L<imit> option to workaround memory leaks