Initial version
Add ourself to auto-mode-alist for COMMIT_EDITMSG
Add a face for pseudo headers

Signed-Off-By, Acked-By, etc.
Special face for known pseudo headers
Add a key binding to commit

It doesn't do anything other than saving the buffer by
default. However, there's a hook to do custom things, like also
terminating the editor, which is useful when emacs is configured to be
started by git commit. I imagine things like magit might want to do
something completely different here.
WIP: signoff command
WIP: note highlighting
Explain git-commit-commit-hook a little
Add utility to find the place to add new pseudo headers
Make sure not to match header-like constructs in comments
Add helper to access env vars
Implement getting user name and email for signoffs and similar
Insert the right amount of whitespace with headers
Factor out header insertion
Merge branch 'signoff'

* signoff:
Factor out header insertion
Insert the right amount of whitespace with headers
Implement getting user name and email for signoffs and similar
Add helper to access env vars
Make sure not to match header-like constructs in comments
Add utility to find the place to add new pseudo headers
WIP: signoff command
Add shortcuts for additional headers
Allow adding Cc and Reported-by headers
Merge branch 'master' into notes

* master:
Allow adding Cc and Reported-by headers
Add shortcuts for additional headers
Factor out header insertion
Insert the right amount of whitespace with headers
Implement getting user name and email for signoffs and similar
Add helper to access env vars
Make sure not to match header-like constructs in comments
Add utility to find the place to add new pseudo headers
Explain git-commit-commit-hook a little
WIP: signoff command
Allow notes for headers to be inserted

This can be done either by passing the text to be inserted as a note,
or by just passing t, which will insert most of the note and drop the
point off where the note's text is supposed to go.
Only leave the point where to insert a note if necessary