Deprecated importlib module and deprecated get_cache

[SimonSteinberger]

Django's importlib module will be removed with the next version (1.9).
Also, 'get_cache' is deprecated in favor of 'caches'.

Please replace in utils.py:

from django.utils.importlib import import_module

With the Python importlib:

from importlib import import_module

You can modify the get_cache import like that, so it works with all Django versions:

try:
----from django.core.cache import caches
except:
----from django.core.cache import get_cache as caches

Then load the cache like so:

cache = hasattr(caches, 'call') and caches(cache_name) or caches[cache_name]

Wonderful tool by the way! Thank you :-)

[jieter]

Just updated to 1.8 and got the warnings too, would be nice if these will be fixed.

[jsocol]

Fixed by #70