[ANN] Tork 20.0.0 - test with fork

Tork runs your tests as they change, in parallel:

  1. Absorbs test execution overhead into a master process.
  2. Forks to inherit overhead and run test files in parallel.
  3. Avoids running unchanged tests inside changed test files.

Manuals: https://sunaku.github.io/tork/man
Sources: https://github.com/sunaku/tork
Support: https://github.com/sunaku/tork/issues
Package: https://rubygems.org/gems/tork

## Version 20.0.0 (2014-10-26)

### Major:

  * tork-runner(1): percentage lied; print counts instead.

    The percentage of completion is not accurate because it only measures
    how many tests that have started running _so far_ have been completed.
    This makes the percentage jump from 100% to lesser values as tests run.

    Also drop the `tork-runner:` prefix from progress messages and replace
    VT100 escape codes for reprinting in-place with a \r (carriage return).

  * Shorten all status message tokens to ~4 characters.

    * In tork-driver(1):
      * `reabsorb` is now `over`

    * In tork-engine(1):
      * `idle` is now `done`
      * `pass_now_fail` is now `fail!`
      * `fail_now_pass` is now `pass!`

    * In tork-master(1):
      * `absorb` is now `boot`

  * Shorten all commands names down to ~4 characters.

    * In tork(1):
      * the `o` input command character is now named `b`

    * In tork-driver(1):
      * the `run_all_test_files` command is now named `test!`
      * the `over` message is now named `boot!`

    * In tork-engine(1):
      * the `reabsorb_overhead` command is now named `boot!`
      * the `run_test_file` command is now named `test`
      * the `run_test_files` command is now named `test`
      * the `stop_running_test_files` command is now named `stop`
      * the `rerun_passed_test_files` command is now named `pass!`
      * the `rerun_failed_test_files` command is now named `fail!`
      * the `list_failed_test_files` command is now named `fail?`
      * the `over` status message is now named `boot!`

### Minor:

  * tork-engine(1): add `test?` and `pass?` listing commands.

  * tork(1): emit "tork:" prefix on all messages sent to user.

### Other:

  * Upgrade to md2man 4.0 and binman 4.0.