Add utility functions similar to those found in stdlib io package #549
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Per our conversation in data-preservation-programs/singularity#325, I decided to go ahead and implement a PipeStorage and a TeeStorage, analogous to io.Pipe and io.TeeReader.
Also I defined a "FinalizableStorage" based on the implementation in
go-car
to universalize the concept for "Finalize()"If these seem useful, I'll do the work to finish this off. (testing and cleanup) Let me know