Started revamp of the Tilemap system. Also removed old 'Advanced Physics' and dropped in p2.js which is what I hope we'll eventually use.

src/tilemap/Tileset.js

@@ -0,0 +1,50 @@
+
+Phaser.Tileset = function (key, tileWidth, tileHeight) {
+
+    /**
+    * @property {string} key - The cache ID.
+    */
+    this.key = key;
+
+    this.tilewidth = tileWidth;
+    this.tileHeight = tileHeight;
+
+    this._tiles = [];
+
+}
+
+Phaser.Tileset.prototype = {
+
+    addTile: function (tile) {
+
+        this._tiles.push(tile);
+
+        return tile;
+
+    },
+
+    getTile: function (index) {
+
+        if (this._tiles[index])
+        {
+            return this._tiles[index];
+        }
+
+        return null;
+
+    }
+
+}
+
+/**
+* @name Phaser.Tileset#total
+* @property {number} total - The total number of tiles in this Tileset.
+* @readonly
+*/
+Object.defineProperty(Phaser.Tileset.prototype, "total", {
+
+    get: function () {
+        return this._ties.length;
+    }
+
+});