Add tasks for all the new languages

Task/Fractran/Sidef/fractran.sidef

@@ -0,0 +1,28 @@
+var str ="17/91, 78/85, 19/51, 23/38, 29/33, 77/29, 95/23, 77/19, 1/17, 11/13, 13/11, 15/14, 15/2, 55/1"
+const FractalProgram = str.split(',').map{.to_r}      #=> array of rationals
+
+func runner(n, callback) {
+    var num = 2.rat
+    n.times {
+        callback(num *= FractalProgram.find { |f| (f*num).de.is_one })
+    }
+}
+
+func prime_generator(n, callback) {
+    var x = 0;
+    runner(Math.inf, { |num|
+        var l = num.to_f.log2
+        if (l.floor == l) {
+            callback(l.to_i)
+            ++x == n && return
+        }
+    })
+}
+
+STDOUT.autoflush(true)
+
+runner(20, {|n| print (n, ' ') })
+print "\n"
+
+prime_generator(20, {|n| print (n, ' ') })
+print "\n"