scalaz/scalaz — pull request #165 by S11001001 (2012-10-12 14:09:12+00:00)
Title: plus and empty from Category shouldn't take type parameters.

```scala
scala> Category[Function1].empty
res0: scalaz.PlusEmpty[[α]α => α] = scalaz.Category$$anon$2@5a357828

scala> Category[Function1].plus
res1: scalaz.Plus[[α]α => α] = scalaz.Compose$$anon$1@2fd06f5
```