Center the stop dialog always when a stop is clicked

Call toggleTrips instead of manually toggling. Now clicking on a stop centers the marker (thanks to @paulserraino's centerMarker chinga) and scrolls the list.

Also fix bug in gulpfile. `clean` was being called every time a watch event happened. So instead just stop cleaning in `serve`. If you need to clean, call `gulp clean` the manuel way.
Merge branch 'master' of github.com:luqmaan/MetroRappid

Conflicts:
	src/js/models/Stop.js