Fixed Plex notifications

Conflicts:

	couchpotato/core/notifications/plex/main.py
Corrected notify() force parameter default.
Fix plex notifications test method.
Create new listener list
Make nonblock debug message
Make sure to remove listener, even after fail
Userscript image didn't show
Don't show suggestions if there aren't any. fix #2153
Remove FTDWorld
Enable NewzNab bij default
Merge branch 'feature/dev_plex' of git://github.com/fuzeman/CouchPotatoServer into fuzeman-feature/dev_plex

Conflicts:
	couchpotato/core/notifications/plex/main.py
Cleanup Plex notification
Merge branch 'refs/heads/fuzeman-feature/dev_plex' into develop
Wrong config name for plex host
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	couchpotato/core/providers/nzb/newznab/__init__.py