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/game.py

@@ -0,0 +1,16 @@
+from worthless.classes.installer.latest import Latest
+from worthless.classes.installer.diff import Diff
+
+
+class Game:
+    def __init__(self, latest, diffs, raw):
+        self.latest = latest
+        self.diffs = diffs
+        self.raw = raw
+
+    @staticmethod
+    def from_dict(data):
+        diffs = []
+        for diff in data['diffs']:
+            diffs.append(Diff.from_dict(diff))
+        return Game(Latest.from_dict(data['latest']), diffs, data)