Add tasks for all the new languages

Task/Anagrams/Swift/anagrams.swift

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+import Foundation
+
+let wordsURL = NSURL(string: "http://www.puzzlers.org/pub/wordlists/unixdict.txt")!
+
+let wordsstring = try NSString(contentsOfURL:wordsURL , encoding: NSUTF8StringEncoding)
+let allwords = wordsstring.componentsSeparatedByString("\n")
+
+let words = allwords//[0..<100] // used to limit the size while testing
+
+extension String {
+    var charactersAscending : String {
+        return String(Array(characters).sort())
+    }
+}
+
+var charsToWords = [String:Set<String>]()
+
+var biggest = 0
+var biggestlists = [Set<String>]()
+
+for thisword in words {
+    let chars = thisword.charactersAscending
+
+    var knownwords = charsToWords[chars] ?? Set<String>()
+    knownwords.insert(thisword)
+    charsToWords[chars] = knownwords
+
+    if knownwords.count > biggest {
+        biggest = knownwords.count
+
+        biggestlists = [knownwords]
+    }
+    else if knownwords.count == biggest {
+        biggestlists.append(knownwords)
+    }
+}
+
+print("Found \(biggestlists.count) sets of anagrams with \(biggest) members each")
+for (i, thislist) in biggestlists.enumerate() {
+    print("set \(i): \(thislist.sort())")
+}