enhancementhelp wanted
描述
Add gulp-watch to the project and add an explicit watch command. include a watchPath property in the config which conforms to a gulp-watch glob. If no watchPath property is set it should maybe default to project root with exceptions for common files and directories e.g. node_modules bower_components dist vendor build bower.json package.json or invisible files & directories. Documentation should be clear about this and include some tested glob boilerplate.