Gruntfile.js

module.exports = function(grunt){
	grunt.initConfig({
		sass:{
			target:{
				options:{
					style: "compressed"
				},
				files:{
					"development_files/style.css" : "development_files/style.scss"
				}
			}
		},
		jshint:{
			beforeconcat: ['development_files/*.js'],
    	afterconcat: ['js/script.js']
		},
		concat:{
			target:{
				options:{
					separator: grunt.util.linefeed
				},
				files:{
					"js/script.js" : ["development_files/*.js"]
				}
			}
		},
		uglify:{
			target:{
				files: {
					"js/script.min.js" : "js/script.js"
				}
			}
		},
		watch:{
			options: {
			  livereload: true
			},
			css: {
			  files: 'development_files/**/*.scss',
			  tasks: ["sass","autoprefixer"]
			},
			js: {
			  files: 'development_files/**/*.js',
			  tasks: ["jshint","concat","uglify"]
			},
			jade:{
				files: 'development_files/**/*.jade',
			  tasks: ["jade"]
			}
		},
		karma:{
			target:{
				configFile: 'karma.conf.js'
			}
		},
		connect: {
			server: {
		    options: {
		      hostname: 'localhost',
		      port: 8000
		    }
		  }
		},
		open: {
			dev: {
		    path: 'http://localhost:8000'
		  }
		},
		jade: {
			compile: {
				options:{
					pretty: true,
				},
	      files: [{
			    expand: true,
			    cwd: 'development_files',
			    src: [ '*.jade' ],
			    dest: '',
			    ext: '.html'
			  }]
			}
		},
		autoprefixer: {
		  single_file: {
		    src: 'development_files/style.css',
		    dest: 'css/style.css'
		  }
		},
		sprite:{
      all: {
        src: 'images/sprites/*.png',
        destImg: 'images/spritesheet.png',
        destCSS: 'css/sprites.css'
      }
    },
    imagemin: {
	    dynamic: {                        
	      files: [{
	        expand: true,                  
	        cwd: 'images',                  
	        src: ['**/*.{png,jpg,gif}'], 
	        dest: 'images'                 
	      }]
	    }
	  }
	});
	grunt.loadNpmTasks("grunt-contrib-sass");
	grunt.loadNpmTasks("grunt-contrib-jshint");
	grunt.loadNpmTasks("grunt-contrib-concat");
	grunt.loadNpmTasks("grunt-contrib-uglify");
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-contrib-connect');
	grunt.loadNpmTasks('grunt-contrib-jade');
	grunt.loadNpmTasks('grunt-open');
	grunt.loadNpmTasks('grunt-karma');
	grunt.loadNpmTasks('grunt-autoprefixer');
	grunt.loadNpmTasks('grunt-spritesmith');
	grunt.loadNpmTasks('grunt-contrib-imagemin');
	grunt.loadNpmTasks('grunt-notify');

	grunt.registerTask("default", ["jade","sass","autoprefixer","jshint","concat","uglify","connect","open:dev","watch"]);
	grunt.registerTask("sprites", "sprite");
	grunt.registerTask("images", "imagemin");
	grunt.registerTask("test","karma");
}