add throttle.py

closes #101

modules/throttle.py

@@ -0,0 +1,18 @@
+from src import ModuleManager, utils
+
+class ThrottleSetting(utils.Setting):
+    def parse(self, value):
+        lines, _, seconds = value.partition(":")
+        if lines.isdigit() and seconds.isdigit():
+            return [int(lines), int(seconds)]
+        return None
+
+@utils.export("serverset", ThrottleSetting("throttle",
+    "Configure lines:seconds throttle for the current server", example="4:2"))
+class Module(ModuleManager.BaseModule):
+    @utils.hook("received.001")
+    def connect(self, event):
+        throttle = event["server"].get_setting("throttle", None)
+        if throttle:
+            lines, seconds = throttle
+            event["server"].socket.set_throttle(lines, seconds)