bash completion updates

The following changes since commit aba170cdb4874b72dd619e6f7bbc13c33295f831:
  Junio C Hamano (1):
        GIT 1.5.2

are available in the git repository at:

  repo.or.cz:/srv/git/git/fastimport.git master

Jonas Fonseca (1):
      Update bash completion to ignore some more plumbing commands

Shawn O. Pearce (7):
      Hide the plumbing diff-{files,index,tree} from bash completion
      Teach bash completion about git-shortlog
      Remove a duplicate --not option in bash completion
      Update bash completion header documentation
      Teach bash completion about 'git remote update'
      Teach bash completion about recent log long options
      Update bash completion for git-config options

 contrib/completion/git-completion.bash |   81 ++++++++++++++++++++++++++++----
 1 files changed, 71 insertions(+), 10 deletions(-)

These are relative to the 1.5.2 tip commit, so they should be able to go just about anywhere. I consider them all to be new features, but they should really be suitable for inclusion in a 1.5.2.1 release.

Note that my master branch doesn't contain my maint branch; I'm expecting you to merge things up on your end. ;-)