add BigIntegerConverter#308

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arnzel wants to merge 4 commits intoaaberg:masterfrom

Commits on Nov 16, 2018

add BigIntegerConverter
Arne Zelasko
committed
add to DefaultConverters
Arne Zelasko
committed

Commits on Nov 21, 2018

add tests for BigIntegerConverter
Arne Zelasko
committed

Commits on Nov 22, 2018

remove assertJ, use hamcrest matcher, converting null values
Arne Zelasko
committed