Add Span API.#35

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g-easy merged 6 commits into

open-telemetry:masterfrom

Feb 25, 2020

Commits on Feb 3, 2020

Add Span API.
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Commits on Feb 11, 2020

Commits on Feb 19, 2020

Follow style guide for accessor.
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Commits on Feb 20, 2020

constify
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Commits on Feb 25, 2020

Update docs: spans don't have to be explicitly ended.
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