Added Instance variables to cookbook

> Do you want to mention that it works only for primitive properties (=
> |number|, |string|, |boolean|, |null| or |undefined|)? 
I wouldn't emphazise on that, since it is only a very special case, and
the constructor-pattern is failsafe.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/coffeescript-cookbook/coffeescript-cookbook.github.com/pull/121/files#r17658658>.
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