grpc - RPC system from Google

	Commit message (Collapse)	Author	Age
*	auto-fix most of licenses	Jan Tattermusch	2017-06-08
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*	Mark connectivity closures as nullable and check null when invoking them	Muxi Yan	2016-10-30
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*	Use nil function instead of empty function	Muxi Yan	2016-10-28
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*	Revert format changes in related files	Muxi Yan	2016-10-28
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*	clang-format format clean	Muxi Yan	2016-10-25
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*	clean with clang-format	Muxi Yan	2016-10-21
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*	Fix nonnull problem	Muxi Yan	2016-10-20
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*	Flush host when network connectivity changes	Muxi Yan	2016-10-20
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*	Clean up ownership of the connection loss handler	Jorge Canizales	2016-03-11
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*	Add monitoring of connectivity	Jorge Canizales	2016-03-11
	Move C-layer call creation into GRPCChannel, so that it always acts on a non-destroyed channel. Listen for connectivity in the GRPCCall, and destroy the channel.