fix($compile): respect return value from controller constructor

docs/content/error/$compile/noctrl.ngdoc

@@ -0,0 +1,68 @@
+@ngdoc error
+@name $compile:noctrl
+@fullName Controller is required.
+@description
+
+When using the `bindToController` feature of AngularJS, a directive is required
+to have a Controller, in addition to a controller identifier.
+
+For example, the following directives are valid:
+
+```js
+// OKAY, because controller is a string with a label component.
+directive("okay", function() {
+  return {
+    bindToController: true,
+    controller: "myCtrl as $ctrl"
+    scope: {
+      text: "@text"
+    }
+  };
+});
+
+
+// OKAY, because the directive uses the controllerAs property to override
+// the controller identifier.
+directive("okay2", function() {
+  return {
+    bindToController: true,
+    controllerAs: "$ctrl",
+    controller: function() {
+
+    },
+    scope: {
+      text: "@text"
+    }
+  };
+});
+```
+
+While the following are invalid:
+
+```js
+// BAD, because the controller property is a string with no identifier.
+directive("bad", function() {
+  return {
+    bindToController: true,
+    controller: "unlabeledCtrl",
+    scope: {
+      text: "@text"
+    }
+  };
+});
+
+
+// BAD because the controller is not a string (therefore has no identifier),
+// and there is no controllerAs property.
+directive("bad2", function() {
+  return {
+    bindToController: true,
+    controller: function noControllerAs() {
+
+    },
+    scope: {
+      text: "@text"
+    }
+  };
+});
+```

src/.jshintrc

@@ -153,6 +153,9 @@
     "urlResolve": false,
     "urlIsSameOrigin": false,
 
+    /* ng/controller.js */
+    "identifierForController": false,
+
     /* ng/compile.js */
     "directiveNormalize": false,