v4.0.0

In short:

• Migration from gaze to chokidar - this will improve stability and responsiveness of gulp-watch
• Events on directory creation is now filtered out
• By default all files (that matched globs) will be emitted on first run with add event
• close() is now not necessary (if you don't use persistent option)
• Event names changed (added -> add, modified -> change and deleted -> unlink)
• All logging now hidden in verbose option
• Lots of issues should be fixed