v1.1.0

- Add nouser, -U, -u options to omit user information from headers.
- Add -Fformat option to select tar header format.
- Add ref=link option to create hard links.
- Add -D, -d options to handle duplicate entries.
- Add -A option to support tar stream concatenation.

v1.0.1

- Support bash <() redirection.

Fix double-recording of recursively-added dirs

Previously, if you added a directory, the directory header would be
written once, and then written again during the file walk stage.

Change-Id: I111e720e2c449411759fffff7808a0871d06b4ac