Grunt LiveReload issue - package.json and Gruntfile.js

Gruntfile.js

'use strict';
module.exports = function(grunt) {

    // load all grunt tasks matching the `grunt-*` pattern
    require('load-grunt-tasks')(grunt);

    grunt.initConfig({

        // watch for changes and trigger compass, jshint, uglify and livereload
        watch: {
            compass: {
                files: ['assets/scss/**/*.{scss,sass}'],
                tasks: ['compass']
            },
            js: {
                files: '<%= jshint.all %>',
                tasks: ['jshint', 'uglify']
            },
            livereload: {
                options: { livereload: true },
                files: ['style.css', 'assets/js/*.js', '*.html', '*.php', 'assets/images/**/*.{png,jpg,jpeg,gif,webp,svg}']
            }
        },

        // compass and scss
        compass: {
            dist: {
                options: {
                    config: 'config.rb',
                    force: true
                }
            }
        },

        // javascript linting with jshint
        jshint: {
            options: {
                jshintrc: '.jshintrc',
                "force": true
            },
            all: [
                'Gruntfile.js',
                'assets/js/source/**/*.js'
            ]
        },

        // uglify to concat, minify, and make source maps
        uglify: {
            plugins: {
                options: {
                    sourceMap: 'assets/js/plugins.js.map',
                    sourceMappingURL: 'plugins.js.map',
                    sourceMapPrefix: 2
                },
                files: {
                    'assets/js/plugins.min.js': [
                        'assets/js/source/plugins.js',
                        // 'assets/js/vendor/yourplugin/yourplugin.js',
                    ]
                }
            },
            main: {
                options: {
                    sourceMap: 'assets/js/main.js.map',
                    sourceMappingURL: 'main.js.map',
                    sourceMapPrefix: 2
                },
                files: {
                    'assets/js/main.min.js': [
                        'assets/js/source/main.js'
                    ]
                }
            }
        },

        // image optimization
        imagemin: {
            dist: {
                options: {
                    optimizationLevel: 7,
                    progressive: true
                },
                files: [{
                    expand: true,
                    cwd: 'assets/images/',
                    src: '**/*',
                    dest: 'assets/images/'
                }]
            }
        },

        // deploy via rsync
        deploy: {
            options: {
                args: ["--verbose"],
                src: "./",
                exclude: ['.git*', 'node_modules', '.sass-cache', 'Gruntfile.js', 'package.json', '.DS_Store', 'README.md', 'config.rb', '.jshintrc'],
                recursive: true,
                syncDestIgnoreExcl: true
            },
            staging: {
                dest: "~/path/to/theme",
                host: "user@host.com"
            },
            production: {
                dest: "~/path/to/theme",
                host: "user@host.com"
            }
        }

    });

    // rename tasks
    grunt.renameTask('rsync', 'deploy');

    // register task
    grunt.registerTask('default', ['watch']);

};

package.js

{
  "name": "wordpress-starter-theme",
  "version": "1.0.0",
  "dependencies": {
    "load-grunt-tasks": "~0.1.0"
  },
  "devDependencies": {
    "grunt": "~0.4.1",
    "grunt-contrib-compass": "~0.5.0",
    "grunt-contrib-imagemin": "~0.2.0",
    "grunt-contrib-jshint": "~0.6.4",
    "grunt-contrib-uglify": "~0.2.4",
    "grunt-contrib-watch": "~0.5.3",
    "grunt-rsync": "~0.2.0"
  }
}