function isGeneratorObject( value ) {
	return ( hasGenerators && nativeClass( value ) === '[object Generator]' );
}
Tests if a value is a generator object.

@param {*} value - value to test
@returns {boolean} boolean indicating whether value is a generator object

@example
function* generateID() {
    var idx = 0;
    while ( idx < idx+1 ) {
        yield idx;
        idx += 1;
    }
}
var bool = isGeneratorObject( generateID() );
// returns true

@example
var bool = isGeneratorObject( {} );
// returns false

@example
var bool = isGeneratorObject( null );
// returns false