Added Gender for ToOrdinalWords (needed for Brazilian Portuguese)
Added pt-br localisation gender for number to words.
Added pt-br localisation for ordinal words, with gender.
Pull Request #196 added to release notes
Moved English ordinal tests to NumberToWordsTests
Some minor formatting fixes
Added readme documentation for ToOrdinalWords with Gender.
Updated readme to state Ordinal Gender is optional.
tidied up BrazilianPortugueseNumberToWordsConverter
explained optional gender for ToOrdinalWords a bit more
removed INumberToWordsConverter