Adds basic support for the Swift programming language

Text only lexer for now until Pygments catches up

samples/Swift/section-65.swift

@@ -0,0 +1,21 @@
+enum Rank: Int {
+    case Ace = 1
+    case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
+    case Jack, Queen, King
+    func simpleDescription() -> String {
+        switch self {
+            case .Ace:
+                return "ace"
+            case .Jack:
+                return "jack"
+            case .Queen:
+                return "queen"
+            case .King:
+                return "king"
+            default:
+                return String(self.toRaw())
+        }
+    }
+}
+let ace = Rank.Ace
+let aceRawValue = ace.toRaw()