Add tasks for all the new languages

Task/Comma-quibbling/Swift/comma-quibbling.swift

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+let inputs = [[], ["ABC"], ["ABC", "DEF"], ["ABC", "DEF", "G", "H"]]
+
+func quibbling(var words:[String]) {
+    if words.count == 0 {
+        println("{}")
+    } else if words.count == 1 {
+        println("{\(words[0])}")
+    } else if words.count == 2 {
+        println("{\(words[0]) and \(words[1])}")
+    } else {
+        var output = "{"
+        while words.count != 2 {
+            output += words.removeAtIndex(0) + ", "
+        }
+        output += "\(words.removeAtIndex(0)) and \(words.removeAtIndex(0))}"
+
+        println(output)
+    }
+}
+
+for word in inputs {
+    quibbling(word)
+}