proper shebang line

tools/update_revnum.py

@@ -1,13 +1,14 b''
+#!/usr/bin/env python
 """ Change the revision number in Release.py """
 
 import os
 import re
 
 rev = os.popen('svnversion ..').read().strip()
 
 print "current rev is",rev
 assert ':' not in rev
 
 rfile = open('../IPython/Release.py').read()
 newcont = re.sub(r'revision\s*=.*', "revision = '%s'" % rev, rfile)
 open('../IPython/Release.py','w').write(newcont)