If grunt-csscss complains:
Warning: Ruby and csscss have to be installed and in your PATH for this task to run. Use --force to continue.
run gem install csscss and it should go away.
| // Default task. | |
| grunt.registerTask('default', 'lint'); | |
| grunt.registerTask('lint', ['jshint', 'csscss']); | |
| // jenkins should run this | |
| grunt.registerTask('build', 'jshint clean copy requirejs cssmin'); | |
| grunt.loadNpmTasks('grunt-contrib'); | |
| grunt.loadNpmTasks('grunt-contrib-jshint'); | |
| grunt.loadNpmTasks('grunt-csscss'); | 
If grunt-csscss complains:
Warning: Ruby and csscss have to be installed and in your PATH for this task to run. Use --force to continue.
run gem install csscss and it should go away.