stop relying on ujson (fix #589, #587, #507)#637

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ziirish wants to merge 3 commits intomasterfrom

Commits on May 6, 2019

stop relying on ujson (fix #589, #587, #507)
ziirish
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Commits on May 13, 2019

let the user choose a custom json serializer through the RESTPLUS_JSON_SERIALIZER config option
ziirish
committed

Commits on May 27, 2019

notify the user in case we couldn't load the custom serializer through a warnings.warn(UserWarning)
ziirish
committed