Grapefruit updated

Yesterday, I updated the Grapefruit FRP library once again, this time to make it compatible with GHC 7.8. The new version is 0.1.0.5. To install or update, you can use the following commands:

cabal update
cabal install grapefruit-ui-gtk grapefruit-examples

Many thanks to Samuel Gélineau for providing several patches. (By the way, Samuel maintains an interesting page that compares different FRP libraries, the FRP Zoo.)

Grapefruit 0.1 is actually a phase-out model, which I only update to work with newer GHC versions. However, I am working on a new Grapefruit. This will be based on my research about FRP semantics and will be quite different from the old one. I expect that the sound theoretical foundation will lead to a more powerful library with a more sensible interface. One particular new feature will be integration of side effects into FRP, in a purely functional style.

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