Document that the memory increases appear to be necessary for Travis only (and that they do appear to solve the problem there).
Document that the memory increases appear to be necessary for Travis only (and that they do appear to solve the problem there).

RELNOTES=n/a

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=235776445

google/guava,typetools/guava,typetools/guava,mosoft521/guava,mosoft521/guava,EdwardLee03/guava,xasx/guava,xasx/guava,EdwardLee03/guava,mosoft521/guava,google/guava,google/guava