Move public APIs into their own folder

And start writing actual tests for them

api/tests/test-limiter.js

@@ -0,0 +1,29 @@
+"use strict"
+
+var o = require("../../ospec/ospec")
+var domMock = require("../../test-utils/domMock")
+var async = require("./async")
+
+var limiter = require("../limiter")
+
+o.spec("fps limiter", function() {
+    var $window, root
+
+    [ "setTimeout", "requestAnimationFrame" ].forEach(function(type) {
+        o.spec(type, function() {
+            o.beforeEach(function() {
+                $window = domMock()
+                
+                async[type]($window)
+            })
+            
+            o("is a function", function() {
+                o(typeof limiter).equals("function")
+            })
+            
+            o("it returns a function", function() {
+                o(typeof limiter(false)).equals("function")
+            })
+        })
+    })
+})