Adding Ignorelist API and integration.

Created GET/LIST/PUT/POST/DELETE API endpoints for Ignorelist.
Created Ignorelist in the datamodel.
Moved views.py into views/__init__.py and broke out ignore_list.py.
TODO: Breakout others into their own files.
Updated each watcher to check the database for ignorelist entries
instead of the hardcoded datastructure in constants.py
Adding IgnoreEntry to web UI under settings