used shuffle() to shuffle in shuffled()

ExSwift/Array.swift

@@ -327,15 +327,7 @@ extension Array {
     func shuffled () -> Array {
         var shuffled = self
         shuffled.unshare()
-
-        //  Fisher-Yates shuffle
-        for i in 0..self.count {
-            let j = Int.random(max: i)
-            if j != i {
-                shuffled[i] = shuffled[j]
-            }
-            shuffled[j] = self[i]
-        }
+        shuffled.shuffle()
 
         return shuffled
     }

ExSwift/String.swift

@@ -32,7 +32,7 @@ extension String {
     *  @return Charaters at the specified indexes (converted to String)
     */
     subscript (indexes: Int...) -> String[] {
-        return at(reinterpretCast(indexes))
+        return at(indexes)
     }
 
     /**
@@ -57,6 +57,15 @@ extension String {
         return indexes.map { self[$0]! }
     }
 
+    /**
+    *  Returns the characters at the specified indexes
+    *  @param indexes
+    *  @return Array of characters (as String)
+    */
+    func at (indexes: Int[]) -> String[] {
+        return indexes.map { self[$0]! }
+    }
+
     /**
     *  Returns an array of strings, each of which is a substring of self formed by splitting it on separator
     *  @param separator