MINOR: Keep python 2.7 restriction only for FCGI wrapper

Only flup is python 2.7 dependent

public_html/extra.wsgi

@@ -1,3 +1,3 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python
 
 from extra import app as application

public_html/run.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python
 
 # Run a test server.
 from extra import app