Serializable service factory#168

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mziccard wants to merge 3 commits intogoogleapis:masterfrom

mziccard:serializable-service-factory

Commits on Sep 21, 2015

Add ServiceFactory interface, extending Serializable. Add factory getter to Service contract. Update all services accordingly.
mziccard
committed
Add tests for factory() getter and factory serialization.
mziccard
committed
Add serialVersionUID and readResolve method to service factories. Updated tests.
mziccard
committed