mcilwain c0f8da0c6e Switch from Guava Optionals to Java 8 Optionals ...

This was a surprisingly involved change. Some of the difficulties included
java.util.Optional purposely not being Serializable (so I had to move a
few Optionals in mapreduce classes to @Nullable) and having to add the Truth
Java8 extension library for assertion support.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171863777

2017-10-24 16:53:47 -04:00

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