Add functionality to copy feed and append to it.#38

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benjaminettori wants to merge 3 commits intoCodeForPhilly:masterfrom

benjaminettori:master

Commits on Mar 29, 2016

Add functionality to copy feed and append to it.
bettori
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Commits on Mar 31, 2016

Make tests more readable
bettori
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Commits on Apr 3, 2016

Add methods to replicate and append to feeds without using promises. Add tape tests for these methods.
bettori
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