gearing up for 2012.4.0.0

[Edward Kmett]

Lest I forget, we'll need to bump mtl to the 2.1.2 that is already on
Hackage to work with changes to the Prelude.

http://hdiff.luite.com/cgit/mtl/commit/?id=73be6cb23732ffb292412602b3b492fbc2a26f6a

-Edward Kmett
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