added docs for python binding. Fixed warning in python binding.

examples/simple_client.cpp

@@ -65,7 +65,7 @@ int main(int argc, char* argv[])
 		in.unsetf(std::ios_base::skipws);
 		entry e = bdecode(std::istream_iterator<char>(in), std::istream_iterator<char>());
 		s.add_torrent(torrent_info(e), "./");
-				
+
 		// wait for the user to end
 		char a;
 		std::cin.unsetf(std::ios_base::skipws);