Log Message:
Update to 1.06. From the changelog:

- released as stable
- clarify docs around tests without a plan
- documentation cleanups and typo fixes
- minor code cleanups
- use warnings in tests
- skip fork test if perl can't fork
- note conflicts with Carp::Always in documentation
- Made had_no_warnings turn off the checking at END time for use with
  done_testing based tests with no test count. Also added docs.