ScaleManager: additional cleanup / fixes

- Sizing events:
  - CHANGE: The `onResize` callback is called only from `preUpdate` (which
    may be triggered from a window resize) and it will be called on
    refreshes even if the parent size has not actually changed.
  - A new `onSizeChange` Signal has been added. It is called _only_ when
    the Game size or Game canvas size has changed and is generally more
    applicable for performing layout updates.

- Game documentation now links to ScaleManager#setGameSize (which was
  renamed from #setGameDimensions)

- Removed extra/legacy full-screen restore code

- Margins:
  - Added `noMargins` flag; if set to true the Canvas margins will never
    be altered. This also means that
  - Margins are now set/cleared individually to avoid conflict with
    'margins' style compound property

- Code consistency updates

Author: pnstickne

src/core/Game.js

@@ -45,20 +45,22 @@ Phaser.Game = function (width, height, renderer, parent, state, transparent, ant
     this.parent = '';
 
     /**
-    * The current game width in pixels.
-    * _Do not modify this property directly._ Use the ScaleManager#setGameSize (`game.scale.setGameSize`) instead.
+    * The current Game Width in pixels.
     *
-    * @property {number} width
+    * _Do not modify this property directly:_ use {@link Phaser.ScaleManager#setGameSize} - eg. `game.scale.setGameSize(width, height)` - instead.
+    *
+    * @property {integer} width
     * @readonly
     * @default
     */
     this.width = 800;
 
     /**
-    * The current game height in pixels.
-    * _Do not modify this property directly._ Use the ScaleManager#setGameSize (`game.scale.setGameSize`) instead.
+    * The current Game Height in pixels.
+    *
+    * _Do not modify this property directly:_ use {@link Phaser.ScaleManager#setGameSize} - eg. `game.scale.setGameSize(width, height)` - instead.
     *
-    * @property {number} height
+    * @property {integer} height
     * @readonly
     * @default
     */