Created EqualityMatchers.deepEqualTo()
Made EqualityMatchers.deepEqualTo() show the path of where the difference was found
Made EqualityMatchers.deepEqualTo() handle null
Made EqualityMatchers.deepEqualTo() dig into Lists
SuiteEventSerializer: serializing StackTrace is now fully working
Refactored SuiteEventSerializer: serialize exception cause the same way as suppressed exceptions
SuiteEventSerializerTest: improved coverage for String