Add ability to remove watchers

[ststeiger]

Add ability to remove watchers:

;WITH CTE AS 
( 
	SELECT 
		 watchers.watchable_type 
		,watchers.id 
		 
		,users.login 
		,users.firstname 
		,users.lastname 
		,users.type 
		 
		,CASE users.status 
			WHEN 1 THEN 'Active' 
			WHEN 2 THEN 'Registered' 
			WHEN 3 THEN 'Locked' 
			WHEN 4 THEN 'Anonymous' 
			ELSE 'Unknown' 
		END AS user_status 
	FROM issues 

	LEFT JOIN watchers 
		ON watchers.watchable_id = issues.id 

	LEFT JOIN users 
		ON users.id = watchers."user_id" 

	WHERE issues.id = 3276 
) 
SELECT * FROM CTE 

-- DELETE FROM watchers WHERE watchers.id = 198