Merge branch 'dp/hash-literally'

* dp/hash-literally:
  add --no-filters option to git hash-object
  add --path option to git hash-object
  use parse_options() in git hash-object
  correct usage help string for git-hash-object
  correct argument checking test for git hash-object
  teach index_fd to work with pipes

diff --cc sha1_file.c
Simple merge