memory leak when watch runs default task

[geddski]

gulp.watch('./public/javascripts/*.js', []);

This runs the default task once the first time, then twice the second time, then four times, etc.

[yocontra]

@robrich This is an orchestrator bug. I'm assuming if you see an empty array you push default onto it?

[yocontra]

Closing due to new task system, this will be fixed in gulp 4.0 (the next release) #355