added multiple inheritance to Class:  - pass in an array of parent classes  - the super function will be bound to the first one  - methods are attached to the prototype with precedence determined by array order (if two classes declare the same method, we choose the method from the earlier class)
added multiple inheritance to Class:
 - pass in an array of parent classes
 - the super function will be bound to the first one
 - methods are attached to the prototype with precedence determined by array order (if two classes declare the same method, we choose the method from the earlier class)



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