grpc - RPC system from Google

	Commit message (Expand)	Author	Age
*	Exposes event#finish as #close.	temiola	2014-12-19
*	Adds support for trailing metadata	temiola	2014-12-16
*	Corrects the incorrect duplex behaviour of bidi_call.rb	temiola	2014-12-11
*	Removed use of call.accept in gRPC Ruby	temiola	2014-12-11
*	Update modules and packages to allow for a single grpc import	temiola	2014-12-11
*	Adds support for metadata to the surface APIs	temiola	2014-12-10
*	Adds ruby versions of the interop server and client	temiola	2014-12-08
*	Updating moe_db.txt with the latest equivalence since the ruby import changed...	nnoble	2014-12-05
*	Incorporating ruby into the master grpc repository.	nnoble	2014-12-01