Make Cloud Spanner Mutations serializable.#1939

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mairbek wants to merge 4 commits intogoogleapis:masterfrom

mairbek:serialize-mutations

Commits on Apr 18, 2017

Make Mutation serializable.
Mairbek Khadikov
committed
Added delete mutation serialization
Mairbek Khadikov
committed
Javadocs and formatting.
Mairbek Khadikov
committed

Commits on Apr 19, 2017

Make codacy-bot happy
Mairbek Khadikov
committed