Feature/add find by to preprocess#170

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urko-b wants to merge 3 commits intobaugarten:masterfrom

urko-b:feature/addFindByToPreprocess

Commits on Jun 26, 2019

feature(addFindByToPreprocess): Added findBy in req object to apply a previous mongodb filter
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Commits on Jun 29, 2019

feature(addFindByToPreprocess): Added unit test
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feature(addFindByToPreprocess): Format model.js
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