ported some more stuff to py 3.3

removed init_jinja_globals hack from app.py after consulting mitsuhiko
(didn't work on py 3.3 "as is")

removed with_statement future imports, not needed any more

needs more work on 2.7 as well as on 3.3

scripts/flaskext_test.py

@@ -9,8 +9,6 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import with_statement
-
 import os
 import sys
 import shutil