scala/scala — pull request #3373 by densh (2014-01-16 10:36:08+00:00)
Title: A few minor changes to standard liftable instances and liftable support

1. Fixes existing `Liftable` definitions to cover more use-cases
2. Renames `UnliftHelper1` into `UnliftListElementwise` and `UnliftHelper2` into `UnliftListOfListsElementwise`
3. Removes redundant asInstanceOf from `Liftable` support implementation

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