code for ruby bidi calls

- server logger.level = WARN
- client logger.level = INFO

- truncates the server debug log entries to make that readable

- moves the client/server behaviour to pb/test
  - deprecate current bin/interop/interop_{client,server}.rb
- adds executable endpoints to bin
  - grpc_ruby_interop_{client, server}
  - these will be added to the ruby bin path when the grpc gem
    gem is installed, making them easier to execute

- Updates the code generated for the interop service
- Moves the generated interop service/client from bin to pb

Also
- removes an empty file from the health pb directories

- they were not returning the correct payload type

- add rubocop as a dev dependency
- fixed many style violations it reported, often using --auto-correct
- add a rubocop config
 - .rubocop.yml shows the exceptions
 - .rubocopy_todo.yml tracks outstanding style issues
- adds a rake task to allow rubocop styling checks to be automated

- fixes the shebang line by moving it above the copyright notice in
  executables.

- also fixes the execution bit on all the binaries

- Adds a dependency to protobuf-ruby in the gemfile
- Updates math.proto to proto3
- Updates math server and client to use protoc protos
- Updates interop server and client to use protoc protos

Also
- Fixes/Updates the noproto samples

TESTED: math_server and math_client can communicate locally.
	Change on 2015/01/07 by temiola <temiola@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=83483448

	Change on 2015/01/07 by ctiller <ctiller@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=83451760

- Adds a dependency to protobuf-ruby in the gemfile
- Updates math.proto to proto3
- Updates math server and client to use protoc protos
- Updates interop server and client to use protoc protos

Also
- Fixes/Updates the noproto samples

TESTED: math_server and math_client can communicate locally.
	Change on 2015/01/07 by temiola <temiola@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=83483448

- 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

- Adds the service and message classes generated from beefcake and a patched proto compiler
- Adds an interop client that uses these service and message classes
- Adds an interop server that implement the service description

TESTED interop client works with the interop server
	Change on 2014/12/08 by temiola <temiola@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81615139