transition to Django 1.5

I like to use django-live-profiler... when i passed to Django 1.5, it will break for 2 reasons :

1. Django 1.5 does not have the compiler. "empty_iter" function, they directly use
```python
"iter([])"
```

2. template tags like {% url name %} change to {% url "name" %} on Django 1.3 with {% load url from future %} and was definitive on Django 1.5.

If you want to cover old Django version, i think the best way is firstly make unit tests and use tox or/and travis.ci...

precision : i test my patch on Django 1.4 and 1.5...