Use cabal to build library. Makefile still needed for generated files and examples.
Expose Control.Fay.

Nothing builds without it.
Change examples to use Fay.Text.

Bouncer and Graph still don't work because of fromRational problem with double
literals.
Remove mapM which is now in Prelude.
Make all Attributes that take numbers monomorphic to Double and use atN to get rid of toText stuff.

Also, lose hShow hack.