Remove class definitions from superclass methods and class creation tests. Add a new class definition test suite
Performance optimizations and new tests for functionality changes:

1. Remove conditionals from constructor for a 16x performance increase in instance creation
2. Don't restore _super's value for a 2x increase in _super() performance
3. Drop support for instantiation without new keyword for a 1.4x performance increase in instance creation
4. Drop support for auto-populating of first argument with an empty object for a 1.4x performance increase in instance creation
5. Don't check hasOwnProperty in mixin() for a 1.3x performance increase (we shouldn't anyway)
Change multi-task name for benchmark
Ignore /misc/ directory, more precise paths for other ignores