Move TestGroupConfig out of TestNG package
Pass TestGroupConfig through to JUnit TestClassIdentifier
Filter included/excluded test classes
Extract a BaseTestClassIdentifier
Actually Filter JUnitTests using Categories
Move the group config class into the testapi package to avoid cyclic dependency
Fix broken exclude logic
Store class annotation values
Use the stored annotation values to filter the tests
Change references to TestNG groups to just "groups"
Merge branch 'junitCategories' of https://github.com/nespera/pitest