Revert "Merge pull request #48 from tpluscode/dictionary-converters"

This reverts commit b6066d4441f1fb487ba92aec483612a7fd06df07, reversing
changes made to 27ecb729ed94c55382ecd486a1b3b2ea6c80d288.
base for setting converter to key and value
unit tests for setting key/value converters
fix test for key/value converter on mapping

not provider
pass mapped key/value converters to generated mapping
remove test mapping
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