Make ChainingOps#tap return A
Make ChainingOps#tap return A

.. so it returns a sane type & works with AnyVal types.

martijnhoekstra/scala,lrytz/scala,lrytz/scala,lrytz/scala,scala/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,scala/scala