Does basic ObjectTool option validation.

def validate(tool_class, model_class):
    """
    Does basic ObjectTool option validation.
    """
    if not hasattr(tool_class, 'name'):
        raise ImproperlyConfigured("No 'name' attribute found for tool %s." % (
            tool_class.__name__
        ))

    if not hasattr(tool_class, 'label'):
        raise ImproperlyConfigured("No 'label' attribute found for tool %s." % (
            tool_class.__name__
        ))

    if not hasattr(tool_class, 'view'):
        raise NotImplementedError("No 'view' method found for tool %s." % (
            tool_class.__name__
        ))