Add tasks for all the new languages

Task/Bulls-and-cows/Coco/bulls-and-cows-1.coco

@@ -0,0 +1,4 @@
+say = print
+prompt = (str) ->
+    putstr str
+    readline! ? quit!

Task/Bulls-and-cows/Coco/bulls-and-cows-2.coco

@@ -0,0 +1,22 @@
+const SIZE = 4
+
+secret = _.sample ['1' to '9'], SIZE
+
+for ever
+    var guess
+    for ever
+        guess := _.uniq prompt 'Enter a guess: '
+        if guess.length === SIZE and not _.difference guess, ['1' to '9'] .length
+            break
+        say 'Malformed guess; try again.'
+    bulls = cows = 0
+    for i til SIZE
+        if guess[i] === secret[i]
+            ++bulls
+        else if _.contains secret, guess[i]
+            ++cows
+    if bulls === SIZE
+        break
+    say "#bulls bull#{[if bulls !== 1 then 's']}, #cows cow#{[if cows !== 1 then 's']}."
+
+say 'A winner is you!'