grpc - RPC system from Google

	Commit message (Collapse)	Author	Age
*	auto-fix most of licenses	Jan Tattermusch	2017-06-08
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*	Update copyrights	Craig Tiller	2016-03-31
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*	update copyrights	Jan Tattermusch	2016-02-18
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*	rename Preconditions to GrpcPreconditions	Jan Tattermusch	2016-02-18
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*	polishing public docs	Jan Tattermusch	2015-08-24
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*	metadata polishing	Jan Tattermusch	2015-08-19
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*	polishing CallOptions	Jan Tattermusch	2015-08-10
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*	added tests	Jan Tattermusch	2015-08-08
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*	context propagation API	Jan Tattermusch	2015-08-08