Gruntfile.js

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

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    imagemin: {
      dist: {
        options: {
          optimizationLevel: 7,
          progressive: true
        },
        files: [{
          expand: true,
          cwd: 'images/',
          src: '{,*/}*.{png,jpg,jpeg}',
          dest: 'images/'
        }]
      }
    },
    imgcompress: {
      dist: {
        options: {
          optimizationLevel: 7,
          progressive: true
        },
        files: [{
          expand: true,
          cwd: 'images/',
          src: '{,*/}*.{png,jpg,jpeg}',
          dest: 'images/'
        }]
      }
    },
    svgmin: {
      dist: {
        files: [{
          expand: true,
          cwd: '_svg/',
          src: '{,*/}*.svg',
          dest: 'svg/'
        }]
      }
    },
    svgstore: {
      options: {
        prefix : 'icon-',
        cleanup: false,
        svg: {
          style: 'display: none;'
        }
      },
      default: {
        files: {
          '_includes/svg-icons.svg':
            ['svg/*.svg']
        }
      }
    }
  });

  // Load tasks
  grunt.loadNpmTasks('grunt-newer');
  grunt.loadNpmTasks('grunt-contrib-imagemin');
  grunt.loadNpmTasks('grunt-imgcompress');
  grunt.loadNpmTasks('grunt-svgstore');
  grunt.loadNpmTasks('grunt-svgmin');

  // Register tasks
  grunt.registerTask('images', ['newer:imgcompress', 'newer:svgmin']);
  grunt.registerTask('svg', ['svgstore'])
};