Create function "watch"

* With this function you can add or delete pages from your watchlist
* Modified Debug.php to make it testable
4 jobs for watch in 1 minute and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Lint
passed #1179
lint:lint-php5.4

00:00:39

passed #1180
lint:lint-php5.6

00:00:37

passed #1181
lint:lint-php7.0

00:00:40

 
  Codesniffer
passed #1182
codesniffer

00:00:31