First pass of the python extension for windows meterpreter

This includes the basic construct for the python extension, and allows
for single-shot commands to be run.

lib/rex/post/meterpreter/extensions/python/python.rb

@@ -0,0 +1,52 @@
+# -*- coding: binary -*-
+
+require 'rex/post/meterpreter/extensions/python/tlv'
+require 'set'
+
+module Rex
+module Post
+module Meterpreter
+module Extensions
+module Python
+
+###
+#
+# Python extension - gives remote python scripting capabilities on the target.
+#
+###
+
+class Python < Extension
+
+  #
+  # Typical extension initialization routine.
+  #
+  # @param client (see Extension#initialize)
+  def initialize(client)
+    super(client, 'python')
+
+    client.register_extension_aliases(
+      [
+        {
+          'name' => 'python',
+          'ext'  => self
+        }
+      ])
+  end
+
+  #
+  # Dump the LSA secrets from the target machine.
+  #
+  # @return [Hash<Symbol,Object>]
+  def execute_string(code)
+    request = Packet.create_request('python_execute_string')
+    request.add_tlv(TLV_TYPE_PYTHON_STRING, code)
+
+    response = client.send_request(request)
+
+    response.get_tlv_value(TLV_TYPE_PYTHON_OUTPUT)
+  end
+
+end
+
+end; end; end; end; end
+