Log Message:
Update to 0.50:

0.50   [2015-06-07]
    - add links to Ovid's tutorial series on Test::Class (Tim Vroom, PR#19)
    - add links to Test::Class::Most, Test::Class::Moose (Tim Vroom, PR#20)
    - list some distributions that use Test::Class in their test suite (Tim
      Vroom, PR#21)
    - update documentation about running individual tests (Matthew Horsfall,
      PR#22)
    - fix some tests to work with the new Test::Stream (Chad Granum, PR#27)
    - switch packaging to ExtUtils::MakeMaker