/*
Specifies a new irregular that applies to both pluralization and singularization at the same time. This can only be used
for strings, not regular expressions. You simply pass the irregular in singular and plural form.

Examples:
String.Inflector.irregular('octopus', 'octopi')
String.Inflector.irregular('person', 'people')
function(singular, plural) {
      var singularFirst      = singular.first(),
          singularRest       = singular.from(1),
          pluralFirst        = plural.first(),
          pluralRest         = plural.from(1),
          pluralFirstUpper   = pluralFirst.toUpperCase(),
          pluralFirstLower   = pluralFirst.toLowerCase(),
          singularFirstUpper = singularFirst.toUpperCase(),
          singularFirstLower = singularFirst.toLowerCase();
      removeFromArray(uncountables, singular);
      removeFromArray(uncountables, plural);
      if(singularFirstUpper == pluralFirstUpper) {
        Inflector.plural(new regexp('({1}){2}$'.assign(singularFirst, singularRest), 'i'), '$1' + pluralRest);
        Inflector.plural(new regexp('({1}){2}$'.assign(pluralFirst, pluralRest), 'i'), '$1' + pluralRest);
        Inflector.singular(new regexp('({1}){2}$'.assign(pluralFirst, pluralRest), 'i'), '$1' + singularRest);
      } else {
        Inflector.plural(new regexp('{1}{2}$'.assign(singularFirstUpper, singularRest)), pluralFirstUpper + pluralRest);
        Inflector.plural(new regexp('{1}{2}$'.assign(singularFirstLower, singularRest)), pluralFirstLower + pluralRest);
        Inflector.plural(new regexp('{1}{2}$'.assign(pluralFirstUpper, pluralRest)), pluralFirstUpper + pluralRest);
        Inflector.plural(new regexp('{1}{2}$'.assign(pluralFirstLower, pluralRest)), pluralFirstLower + pluralRest);
        Inflector.singular(new regexp('{1}{2}$'.assign(pluralFirstUpper, pluralRest)), singularFirstUpper + singularRest);
        Inflector.singular(new regexp('{1}{2}$'.assign(pluralFirstLower, pluralRest)), singularFirstLower + singularRest);
      }
    }