• Ensure prove (and App::Prove) sort any recursively
  discovered tests
  
• It is now possible to register multiple callback handlers for
  a particular event.
  
• Added before_runtests, after_runtests callbacks to
  TAP::Harness.
  
• Moved logic of prove program into App::Prove.
  
• Added simple machine readable summary.
  
• Performance improvement: The processing pipeline within
  TAP::Parser is now a closure which speeds up access to the
  various attribtes it needs.
  
• Performance improvement: Test count spinner now updates
  exponentially less frequently as the count increases which
  saves a lot of I/O on big tests.
  
• More improvements in test coverage from Leif.
  
• Fixes to TAP spooling - now captures YAML blocks correctly.
  
• Fix YAMLish handling of empty arrays, hashes.
  
• Renamed TAP::Harness::Compatible to Test::Harness,
  runtests to prove.
  
• Fixes to @INC handling. We didn't always pass the correct path
  to subprocesses.
  
• We now observe any switches in HARNESS_PERL_SWITCHES.
  
• Changes to output formatting for greater compatibility with
  Test::Harness 2.64.
  
• Added unicode test coverage and fixed a couple of
  unicode issues.
  
• Additions to documentation.
  
• Added support for non-forking Perls. If forking isn't
  available we fall back to open and disable stream merging.
  
• Added support for simulating non-forking Perls to improve our
  test coverage.