Removed useless Makefile and obsolete TODO item

Makefile

@@ -1,6 +0,0 @@
-.PHONY: all clean
-
-all:
-
-clean:
-	find -name \*.pyc -delete

TODO

@@ -1,5 +1,3 @@
 - (Unit) tests
 - Mutual exclusion in Server/Client (multiple threads sending stuff at the same
   time will go wrong)
-- Extensions: pass parameters for Extension.header_params() to websocket
-  constructor