Add support for additional cost elements#1849

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ateirney wants to merge 2 commits intogoogle:mainfrom ateirney:feat/support-extra-costs

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Commits on Jan 20, 2020

feat: add support for adding extra cost variables to the cost function
ateirney
committed
feat: rename the AddExtraCost method in the Java SWIG bindings to be lowerCamelCase
ateirney
committed