grpc - RPC system from Google

	Commit message (Expand)	Author	Age
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\| *	Merge remote-tracking branch 'upstream/master' into string_ref_auth	yang-g	2015-08-26
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\| \| *	Add ostream support for string_ref	Craig Tiller	2015-08-26
\| * \|	auth context api change for string_ref	yang-g	2015-08-25
\| \|/
\| *	impl	yang-g	2015-08-25
\| *	remove constexpr since gcc 4.4 or vs2010 does not support it	yang-g	2015-08-25
\|/
*	Merge branch 'master' of github.com:grpc/grpc into cpp_string_ref	Julien Boeuf	2015-08-24
*	merge with head	yang-g	2015-08-24
*	split stream.h into sync_stream.h and async_stream.h	yang-g	2015-08-21
*	headers reorg	yang-g	2015-08-21