Add tasks for all the new languages

Task/Inheritance-Single/Coco/inheritance-single-1.coco

@@ -0,0 +1,5 @@
+class Animal
+class Cat extends Animal
+class Dog extends Animal
+class Lab extends Dog
+class Collie extends Dog

Task/Inheritance-Single/Coco/inheritance-single-2.coco

@@ -0,0 +1,28 @@
+class Animal
+
+  (@name) ->
+
+  move: (meters) ->
+    alert @name + " moved #{meters}m."
+
+class Snake extends Animal
+
+  -> super ...
+
+  move: ->
+    alert 'Slithering...'
+    super 5
+
+class Horse extends Animal
+
+  -> super ...
+
+  move: ->
+    alert 'Galloping...'
+    super 45
+
+sam = new Snake 'Sammy the Python'
+tom = new Horse 'Tommy the Palomino'
+
+sam.move!
+tom.move!