Merge branch 'maint'

* maint:
  Fixed update-hook example allow-users format.
  Documentation/git-svn: updated design philosophy notes
  t/t4014: test "am -3" with mode-only change.
  Fix lapsus in builtin-apply.c
  git-push: documentation and tests for pushing only branches
  git-svnimport: Use separate arguments in the pipe for git-rev-parse