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>
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=81894613