Merge pull request #278 from mkai/_rq_async_cleanup

Cleaned up RQ cache file backend code, added async_rq setup extra

imagekit/cachefiles/backends.py

@@ -169,12 +169,6 @@ class Async(Celery):
         super(Async, self).__init__(*args, **kwargs)
 
 
-try:
-    import django_rq
-except ImportError:
-    pass
-
-
 class RQ(BaseAsync):
     """
     A backend that uses RQ to generate the images.

setup.py

@@ -57,6 +57,7 @@ setup(
     ],
     extras_require={
         'async': ['django-celery>=3.0'],
+        'async_rq': ['django-rq>=0.6.0'],
     },
     classifiers=[
         'Development Status :: 5 - Production/Stable',