Add support for v0.11 GRPC services

This also refactors the client GRPC wrapper to dynamically load the
request objects.
All GRPC generated client files now live under lib/grpc_services

lib/grpc_services/verrpc/verrpc_services_pb.rb

@@ -0,0 +1,27 @@
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# Source: verrpc/verrpc.proto for package 'verrpc'
+
+require 'grpc'
+require 'verrpc/verrpc_pb'
+
+module Verrpc
+  module Versioner
+    # Versioner is a service that can be used to get information about the version
+    # and build information of the running daemon.
+    class Service
+
+      include GRPC::GenericService
+
+      self.marshal_class_method = :encode
+      self.unmarshal_class_method = :decode
+      self.service_name = 'verrpc.Versioner'
+
+      # lncli: `version`
+      # GetVersion returns the current version and build information of the running
+      # daemon.
+      rpc :GetVersion, VersionRequest, Version
+    end
+
+    Stub = Service.rpc_stub_class
+  end
+end