Simplifying toThrow:
- It still supports no expected, which means that something was thrown
- Expected value is now tested via equality in order to pass

Adding toThrowError:
- toThrowError() passes if an Error type was thrown
- toThrowError(String) & toThrowError(RegExp) compare Expected to the Error message
- toThrowError(Error constructor) compares Expected to the constructor of what was thrown
- toThrowError(Error constructor, String) & toThrowError(Error constructor, RegExp) compares both the Error and the message

Also, equality now handles Errors, enforcing the message as part of the equality.