adds a decimal number format, though this isn't officially part of the open-api spec, which defaults to Decimal
adds a numberType template option which overrides Double for numbers that don't have a format
added a doubleType, floatType and decimalType template options that override Double, Float, and Decimal as the respective default types for those number formats
This resolves #184 in 3 different ways:
decimalnumber format, though this isn't officially part of the open-api spec, which defaults toDecimalnumberTypetemplate option which overridesDoublefor numbers that don't have a formatdoubleType,floatTypeanddecimalTypetemplate options that overrideDouble,Float, andDecimalas the respective default types for those number formats