Stage three of notification rewrite. Page cache refresh required.

Watched notifications added with configurable cutoff percent.
Styling fixes.
Add information back to settings page for required restart on web interface changes.
Use user_id on user link in activity pane.
Added channels option to Pushbullet.
Possible fix for text encoding issues in Plexwatch importer.
Thread the notifications.
Move most of the notification logic to the notification handler.

plexpy/__init__.py

@@ -524,6 +524,13 @@ def dbcheck():
             'ALTER TABLE session_history_metadata ADD COLUMN full_title TEXT'
         )
 
+    # notify_log table :: This is a table which logs notifications sent
+    c_db.execute(
+        'CREATE TABLE IF NOT EXISTS notify_log (id INTEGER PRIMARY KEY AUTOINCREMENT, '
+        'session_key INTEGER, rating_key INTEGER, user_id INTEGER, user TEXT, '
+        'agent_id INTEGER, agent_name TEXT, on_play INTEGER, on_stop INTEGER, on_watched INTEGER)'
+    )
+
     conn_db.commit()
     c_db.close()