Add reexports of enums for mac os x targets so that usage cases are the same for .DecimalStyle etc

Author: phausler

Foundation/NSNumber.swift

@@ -392,7 +392,7 @@ public class NSNumber : NSValue {
 
     public override var description: String {
         let locale = CFLocaleCopyCurrent()
-        let formatter = CFNumberFormatterCreate(nil, locale, .DecimalStyle)
+        let formatter = CFNumberFormatterCreate(nil, locale, kCFNumberFormatterDecimalStyle)
         CFNumberFormatterSetProperty(formatter, kCFNumberFormatterMaxFractionDigits, 15._bridgeToObject())
         return CFNumberFormatterCreateStringWithNumber(nil, formatter, self._cfObject)._swiftObject
     }

Foundation/NSNumberFormatter.swift

@@ -9,6 +9,19 @@
 
 import CoreFoundation
 
+#if os(OSX) || os(iOS)
+internal let kCFNumberFormatterNoStyle = CFNumberFormatterStyle.NoStyle
+internal let kCFNumberFormatterDecimalStyle = CFNumberFormatterStyle.DecimalStyle
+internal let kCFNumberFormatterCurrencyStyle = CFNumberFormatterStyle.CurrencyStyle
+internal let kCFNumberFormatterPercentStyle = CFNumberFormatterStyle.PercentStyle
+internal let kCFNumberFormatterScientificStyle = CFNumberFormatterStyle.ScientificStyle
+internal let kCFNumberFormatterSpellOutStyle = CFNumberFormatterStyle.SpellOutStyle
+internal let kCFNumberFormatterOrdinalStyle = CFNumberFormatterStyle.OrdinalStyle
+internal let kCFNumberFormatterCurrencyISOCodeStyle = CFNumberFormatterStyle.CurrencyISOCodeStyle
+internal let kCFNumberFormatterCurrencyPluralStyle = CFNumberFormatterStyle.CurrencyPluralStyle
+internal let kCFNumberFormatterCurrencyAccountingStyle = CFNumberFormatterStyle.CurrencyAccountingStyle
+#endif
+
 public class NSNumberFormatter : NSFormatter {
 
     typealias CFType = CFNumberFormatterRef