Updates grunt-contrib-jshint
Lints code
Updates node module: grunt-contrib-uglify to v.0.3.2
Includes node module: grunt-contrib-concat

The userminPrepare task creates a configuration for a concat task on
the fly, but does call the concat task or perform the concatenations
itself. A 'concat' task must be called explicitly.
Completes build workflow
Removes unused node module: grunt-ngmin