Update the file caching app

- Add view to list available caches.
- Add links to view and purge caches.
- Add permissions.
- Add events.
- Add purge task.
- Remove document image clear link and view.
  This is now handled by the file caching app.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/file_caching/urls.py

@@ -0,0 +1,20 @@
+from __future__ import unicode_literals
+
+from django.conf.urls import url
+
+from .views import CacheListView, CachePurgeView
+
+urlpatterns = [
+    url(
+        regex=r'^caches/$',
+        name='cache_list', view=CacheListView.as_view()
+    ),
+    url(
+        regex=r'^caches/(?P<cache_id>\d+)/purge/$',
+        name='cache_purge', view=CachePurgeView.as_view()
+    ),
+    url(
+        regex=r'^caches/multiple/purge/$', name='cache_multiple_purge',
+        view=CachePurgeView.as_view()
+    ),
+]