Update modules and packages to allow for a single grpc import

- ensured tests only need to do 'require grpc'
- ensured that the example math_server and math_client only need to do 'require grpc'
- ensured that the other other client and servers only need to do one thing
	Change on 2014/12/11 by temiola <temiola@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81894613
diff --git a/src/ruby/lib/grpc.rb b/src/ruby/lib/grpc.rb
index 1012a83..c7eec33 100644
--- a/src/ruby/lib/grpc.rb
+++ b/src/ruby/lib/grpc.rb
@@ -34,6 +34,10 @@
 require 'grpc/version'
 require 'grpc/core/event'
 require 'grpc/core/time_consts'
+require 'grpc/generic/active_call'
+require 'grpc/generic/client_stub'
+require 'grpc/generic/service'
+require 'grpc/generic/rpc_server'
 
 # alias GRPC
 GRPC = Google::RPC