[PATCH 0/2] commit -t appends newline after template file

These are my first patches to git, so be extra pedantic during review, please.

I noticed, that newline is appended, when I try to use template file - which
is annoying if template ends with comment. I digged a bit and it turned out
that:

* my editor (vim) was appending newline before eof in template, (I forgot
  about this); most editors, that I tested appends newline before eof by
  default. Emacs was exception here.

* commit --status appends newline unconditionally before placing first
  comment line - it needs to do this or comment might be appended to last line
  of template file. Usually, in result two newlines are appended after
  template file content - and unexpected empty line appears in editor.

* tests for git-commit do not verify newlines at all

I fixed tests and wrote few more (patch 1/2) - after applying this patch
some tests won't pass (they shouldn't be passing in the first place imo).
Patch 2 fixes all broken tests.

More detailed description is in mails to follow.