I removed the 'custom' JSON object.
I added the Grunt plugin load-grunt-tasks as a devDependency.
I removed the Grunt plugin grunt-jslint as a devDependency, and installed grunt-contrib-jshint. It'll be nicer.
I uninstalled the Grunt plugin load-grunt-tasks as a devDependency.
I removed the tasks directory and placed all Grunt setup into the gruntfile. The previous setup was too complicated for a one source file repository.