Migrate to from RxJS to xstream#4

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abaco wants to merge 5 commits intoapoco:masterfrom

Commits on May 30, 2017

Update for Cycle Unified.
abaco
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Commits on May 31, 2017

Migrate from RxJS to xstream.
abaco
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Commits on Jun 1, 2017

Add dependency "@cycle/run": "*"
abaco
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Commits on Jun 6, 2017