PROPOSAL: classes for traversals

[Jacques Carette]

This seems like a solid, worthwhile proposal to me as well.  In fact, I 
will start using this in new code, regardless of its acceptance into the 
library.
Jacques

Ross Paterson wrote:

>Conor McBride and I would like to propose some new classes for traversals
>of containers, based around applicative functors (the abstraction formerly
>known as idioms):
>
>	http://www.soi.city.ac.uk/~ross/traversals/
>
>They are proposed for the base package, and would replace FunctorM.
>
>Comments most welcome.
>
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