Implemented upload session APIs (multi-part uploads)#18

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jpillora wants to merge 6 commits intotj:masterfrom jpillora:master

+124-13

Commits on Jul 16, 2016

added upload session APIs (multi-part uploads) with test, renamed download() to content()
jpillora
committed

Commits on Jul 18, 2016

Commits on Jul 19, 2016

sync with upstream
jpillora
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Commits on Jul 21, 2016

make semaphore badge match godoc badge
jpillora
committed