Units of Measures

I added some simple logic to handle units of measures in the NumberUnitToText class. The logic is based on 4 different array which contain the basic information:

• unit_1 is used to handle units that can have a singular and plural: e.g. one dollar but it is two dollars

  • "lb", "pound", "pounds"
  • "ft", "foot", "feet"
  • "in", "inch", "inches"
  • "mi", "mile", "miles"
  • "$", "dollar", "dollars"
  • "¢", "cent", "cents"

• unit_2: is used to assemble units from (potentially) multiple words

  • "mph", "miles", "per", "hour"
  • "C", "degrees", "celcius"
  • "F", "degrees", "fahrenheit"
  • "%", "percent"
  • "lt", "liter"
  • "ml", "milli", "lt"
  • "gr", "gram"
  • "kg", "kilo", "gr"
  • "mg", "milli", "gr"
  • "km", "kilo", "m"
  • "m", "meter"
  • "cm", "centi", "m"
  • "mm", "milli", "m"
  • "usd", "u.s.", "$"

• unit3: split unit before and after the decimal point: 1.20 USD is 1 Dollar and 20 Cents

  • "usd", "¢"
  • "gr", "mg"
  • "kg", "gr"
  • "m", "mm"
  • "km", "m"
  • "lt", "ml"

• decimal_info

  • "usd", 2
  • (default), 3

Please feel free to submit some pull request if you think some critical unit is missing!