Minor improvements

• #37 Added excluePath option to SplitTestsByGroups task. By @thejanasatan
• #36 Added mergeRewrite to merge reports by @maxgorovenko
• #30 Fixed execute test name from data provider by @ivan1986

Also PHPUnit 6 compatibility can be achieved by including Codeception's autoloader:

require  'vendor/codeception/codeception/autoload.php'

See #35 (comment)