Inital by-type split

Split type.class from CssTypeSelector to CssCompositeSelector, probably support type#id.class selectors

Apply review comments, refactor css-selectors internally

Applied refactoring, all tests pass, button does not notify changes

Add tests for the css selectors parser.

Added tests for css-selectors

Added basic implementation of mayMatch and changeMap for css match state

Implemented TKUnit.assertDeepEqual to check key and key/values in Map and Set

Watch for property and pseudoClass changes

Add one child group test

Add typings for animations

Added mechanism to enable/disable listeners for pseudo classes

Count listeners instead of checking handlers, reverse subscription and unsubscription

tns-core-modules/ui/styling/styling.d.ts

@@ -307,24 +307,4 @@
          */
         export function visibilityConverter(cssValue: any): number;
     }
-
-    /**
-     * Encapsulates visual states names.
-     */
-    module visualStates {
-        /**
-         * The normal visual state.
-         */
-        export var Normal: string;
-
-        /**
-         * The hovered visual state.
-         */
-        export var Hovered: string;
-
-        /**
-         * The pressed visual state.
-         */
-        export var Pressed: string;
-    }
 }