Add tasks for all the new languages

Task/Range-extraction/Swift/range-extraction-1.swift

@@ -0,0 +1,47 @@
+func rangesFromInts(ints:[Int]) -> [(Int, Int)] {
+
+    var range : (Int, Int)?
+    var ranges = [(Int, Int)]()
+    for this in ints {
+        if let (start, end) = range {
+            if this == end + 1 {
+                range = (start, this)
+            }
+            else {
+                ranges.append(range!)
+                range = (this, this)
+            }
+        }
+        else { range = (this, this) }
+    }
+    ranges.append(range!)
+
+    return ranges
+}
+
+func descriptionFromRanges(ranges:[(Int, Int)]) -> String {
+    var desc = ""
+    for (start, end) in ranges {
+        desc += desc.isEmpty ? "" : ","
+        if start == end {
+            desc += "\(start)"
+        }
+        else if end == start + 1 {
+            desc += "\(start),\(end)"
+        }
+        else {
+            desc += "\(start)-\(end)"
+        }
+    }
+    return desc
+}
+
+
+let ex = [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20]
+let longer = [0,  1,  2,  4,  6,  7,  8, 11, 12, 14,
+    15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+    25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
+    37, 38, 39]
+
+descriptionFromRanges(rangesFromInts(ex))
+descriptionFromRanges(rangesFromInts(longer))

Task/Range-extraction/Swift/range-extraction-2.swift

@@ -0,0 +1,35 @@
+extension NSIndexSet {
+
+    var rangesDescription : String {
+        var out = ""
+        indexSet.enumerateRangesUsingBlock { range, _ in
+            let start = range.location
+            let end = range.location+range.length-1
+            out += out.isEmpty ? "" : ","
+            if start == end {
+                out += "\(start)"
+            }
+            else if end == start + 1 {
+                out += "\(start),\(end)"
+            }
+            else {
+                out += "\(start)-\(end)"
+            }
+        }
+        return out
+    }
+}
+
+let ex = [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20]
+let longer = [0,  1,  2,  4,  6,  7,  8, 11, 12, 14,
+    15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+    25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
+    37, 38, 39]
+
+var indexSet = NSMutableIndexSet()
+ex.map { indexSet.addIndex($0) }
+indexSet.rangesDescription
+
+var indexSet2 = NSMutableIndexSet()
+longer.map { indexSet2.addIndex($0) }
+indexSet2.rangesDescription