Bump NPM package versions

*    "bower": "~1.3.5",
*    "grunt": "~0.4.5",
*    "grunt-autoprefixer": "~0.8.0",
*    "grunt-contrib-less": "~0.11.3",
*    "grunt-contrib-uglify": "~0.5.0",
*    "load-grunt-tasks": "~0.6.0",
*    "time-grunt": "~0.3.2"