Fixed broken constructor.

cache.py

@@ -28,7 +28,7 @@ def seconds_to_datetime(seconds):
     return datetime(*gmtime(seconds)[:7])
 
 
-class Cache:
+class Cache(object):
     """
     A Cache instance represents a single file in the cache directory, which is
     a concatenation of the file list.

importer.py

@@ -54,7 +54,7 @@ def separate_imports(content):
 
 class Importer(Cache):
     def __init__(self, files=[], extension=None, **kwargs):
-        Cache.__init__(self, **kwargs)
+        super(Importer, self).__init__(**kwargs)
 
         self.aliases = {}