Handler class for the MOAssertions macros and functions.
Superclass: NSObject
An instance of MOAssertionHandler is used to implement policy for handling assertion failures. A single shared instance is created when needed, or an instance can be set to be used as the shared instance. The default instance created is directly of the class MOAssertionHandler, but subclasses can be created and instances of them used to alter the default handling policies. The default policy for an assertion failure is to log a message about it and then raise an exception.