Wrap game resource info from the server

Also add function to get the diff archive (for faster updating)

Download function soon, although I can't make sure that the download function will work properly (like pause, resume download etc.)

worthless/classes/installer/resource.py

@@ -0,0 +1,30 @@
+from worthless.classes.installer.game import Game
+
+
+class Resource:
+    """Contains the game resource information.
+
+    Everything except `game` is not wrapped yet
+
+    Attributes:
+
+    - :class:`worthless.classes.launcher.background.Background` background: The launcher background information.
+    - :class:`worthless.classes.launcher.banner.Banner` banner: The launcher banner information.
+    - :class:`worthless.classes.launcher.iconbutton.IconButton` icon: The launcher icon buttons information.
+    - :class:`worthless.classes.launcher.qq.QQ` post: The launcher QQ posts information.
+    - :class:`dict` raw: The launcher raw information.
+    """
+    def __init__(self, game, plugin, web_url, force_update, pre_download_game, deprecated_packages, sdk, raw):
+        self.game = game
+        self.plugin = plugin
+        self.web_url = web_url
+        self.force_update = force_update
+        self.pre_download_game = pre_download_game
+        self.deprecated_packages = deprecated_packages
+        self.sdk = sdk
+        self.raw = raw
+
+    @staticmethod
+    def from_dict(data):
+        return Resource(Game.from_dict(data['game']), data['plugin'], data['web_url'], data['force_update'],
+                        data['pre_download_game'], data['deprecated_packages'], data['sdk'], data)