Add tasks for all the new languages

Task/Search-a-list/Swift/search-a-list-1.swift

@@ -0,0 +1,8 @@
+let haystack = ["Zig","Zag","Wally","Ronald","Bush","Krusty","Charlie","Bush","Bozo"]
+for needle in ["Washington","Bush"] {
+  if let index = haystack.indexOf(needle) {
+    print("\(index) \(needle)")
+  } else {
+    print("\(needle) is not in haystack")
+  }
+}

Task/Search-a-list/Swift/search-a-list-2.swift

@@ -0,0 +1,8 @@
+let haystack = ["Zig","Zag","Wally","Ronald","Bush","Krusty","Charlie","Bush","Bozo"]
+for needle in ["Washington","Bush"] {
+    if let index = find(haystack, needle) {
+        println("\(index) \(needle)")
+    } else {
+        println("\(needle) is not in haystack")
+    }
+}

Task/Search-a-list/Swift/search-a-list-3.swift

@@ -0,0 +1,20 @@
+// the second part can be done several ways, but extending any Array of Comparable objects is the most generic approach
+extension Array where Element : Comparable {
+    func lastIndexMatching(needle:Element) -> Int? {
+
+        for i in stride(from: count-1, through: 0, by: -1) {
+            if self[i] == needle {
+                return i
+            }
+        }
+        return nil
+    }
+}
+
+for needle in ["Washington","Bush"] {
+    if let index = haystack.lastIndexMatching(needle) {
+        print("\(index) \(needle)")
+    } else {
+        print("\(needle) is not in haystack")
+    }
+}