add #/usr/bin/env python to all python files

modules/python/src2/cv.py

@@ -1 +1,3 @@
+#/usr/bin/env python
+
 from cv2.cv import *

modules/python/src2/gen.py

@@ -1,3 +1,5 @@
+#/usr/bin/env python
+
 import sys
 from string import Template
 

modules/python/src2/gen2.py

@@ -1,3 +1,5 @@
+#/usr/bin/env python
+
 import hdr_parser, sys, re, os, cStringIO
 from string import Template
 

modules/python/src2/hdr_parser.py

@@ -1,3 +1,5 @@
+#/usr/bin/env python
+
 import os, sys, re, string
 
 # the list only for debugging. The real list, used in the real OpenCV build, is specified in CMakeLists.txt