Rc1 add async examples#1

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carlosalberto wants to merge 6 commits intomasterfrom

rc1_add_async_examples

Commits on Sep 13, 2017

Implement a simpler Span propagation without lifetime handling.
carlosalberto
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Commits on Sep 20, 2017

Make the async_propagation sample use the new Scope, as needed.
carlosalberto
committed