Create tags from sub directories

The names of sub directories in the consumer directory will be added as
tags for the document to be consumed.
To enable this, set:
PAPERLESS_CONSUMER_RECURSIVE=1
PAPERLESS_CONSUMER_SUBDIRS_AS_TAGS=1

Fixes #50

Pipfile

@@ -38,7 +38,7 @@ scikit-learn="~=0.23.2"
 whitenoise = "~=5.2.0"
 watchdog = "*"
 whoosh="~=2.7.4"
-inotify-simple = "*"
+inotifyrecursive = ">=0.3.4"
 
 [dev-packages]
 coveralls = "*"