add ability to read from a stream

do not use this unless you understand what you are doing and you want to take the risk,
you are warnned

src/mod/languages/mod_lua/my_swigable_cpp.h

@@ -22,7 +22,9 @@ class Stream {
 	    Stream(void);
 	     Stream(switch_stream_handle_t *);
 	                       virtual ~ Stream();
+	string read();
 	void write(const char *data);
+	void raw_write(void *data, int len);
 	const char *get_data(void);
 };