ga-wdi-boston/ruby-object-model

Make objectives better match what Rachel wrote on board on delivery 015

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Give two reasons why inheritance and mixins are desirable

Describe the difference between inheritance, composition, and mixins.

Related to #13

Current objectives are:

-   Give two reasons why inheritance and Mixins are desirable.
-   Write a class which inherits from another class.
-   Describe why mixins are preferred to inheritance.

So, all inheritance objectives are moving to ga-wdi-boston/ruby-object-inheritance, so the middle objective can go.
Maybe describe when you should use inheritance, composition, or mixins?