Gruntfile.js

module.exports = function(grunt) {
	require('time-grunt')(grunt);
	require('load-grunt-tasks')(grunt); 

	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		copy: {
			dist: {
				files: [{
					expand: true,
					cwd: 'site/dev',
					src: ['**', '!sass/**'],
					dest: 'site/dist/'
				}]
			}, // dist
			html: {
				files: [{
					expand: true,
					cwd: 'site/dev',
					src: ['css/**', 'js/**', 'images/**'],
					dest: 'site/html/'
				}]
			}, // html
			styleguide: {
				files: [{
					expand: true,
					cwd: 'site/dev',
					src: ['css/**', 'js/**', 'images/**'],
					dest: 'site/styleguide/'
				}]
			},
			htmlstyleguide: {
				files: [{
					expand: true,
					cwd: 'site/styleguide',
					src: ['css/**', 'js/**', 'images/**'],
					dest: 'site/html-styleguide/'
				}]
			}
		}, //copy

		// remove all files from folder xxx
		clean: {
			dist: ['site/dist'],
			html: ['site/html'],
			htmlstyleguide: ['site/html-styleguide']
		},

		sass: {
			dev: {
				options: {
					sourceMap: false,
					outputStyle: 'expanded'
				}	,
				files: [{
					expand: true,
					cwd:  'site/dev/sass',
					src:  ['*.scss'],
					dest: 'site/dev/css',
					ext:  '.css'
				}]
			},
			styleguide: {
				options: {
					sourceMap: false,
					outputStyle: 'expanded'
				},
				files: [{
					expand: true,
					cwd:  'site/styleguide/sass',
					src:  ['*.scss'],
					dest: 'site/styleguide/css',
					ext:  '.css'
				}]
			}	
		}, // sass
		watch: {
			dev: {
				files: ['site/dev/sass/**/*.scss'],
				tasks: ['sass:dev']
			},
			styleguide: {
				files: ['site/styleguide/sass/**/*.scss'],
				tasks: ['sass:styleguide', 'postcss:styleguide']
			}
		}, // watch

		php2html: {
			dev: {
				options: {
					// Task-specific options go here.
					// relative links should be renamed from .php to .html
					processLinks: true,
					htmlhint: {
						'tagname-lowercase': true,
						'attr-lowercase': true,
						'attr-value-double-quotes': true,
						'doctype-first': true,
						'tag-pair': true,
						'spec-char-escape': true,
						'id-unique': true,
						'src-not-empty': true
					}, // htmlhint
					docroot: 'site/dev'
				}, // options
				files: [{
					expand: true,
					cwd: 'site/dev/',
					src: ['*.php'],
					dest: 'site/html',
					ext: '.html'
				}]
			}, // default
			styleguide: {
				options: {
					// Task-specific options go here.
					// relative links should be renamed from .php to .html
					processLinks: true,
					htmlhint: {
						'tagname-lowercase': true,
						'attr-lowercase': true,
						'attr-value-double-quotes': true,
						'doctype-first': true,
						'tag-pair': true,
						'spec-char-escape': true,
						'id-unique': true,
						'src-not-empty': true
					}, // htmlhint
					docroot: 'site/styleguide'
				}, // options
				files: [{
					expand: true,
					cwd: 'site/styleguide/',
					src: ['*.php'],
					dest: 'site/html-styleguide',
					ext: '.html'
				}]
			}// styleguide
		}, // php2html

		validation: {
			options: {
				reset: grunt.option('reset') || false,
				stoponerror: false
			},
			files: {
				src: ['site/html/*.html']
			}
		}, // validation

		analyzecss: {
			prod: {
				sources: ['site/html/css.css']
			},
			options: {
				outputMetrics: 'error',
				softFail: false,
				thresholds: {
					selectors: 4096,

					// diese Checks werden nicht durchlaufen
					redundantBodySelectors: null,
					comments: null,
					commentsLength: null,
					complexSelectors: null,
					complexSelectorsByAttribute: null,
					duplicatedSelectors: null,
					emptyRules: null,
					expressions: null,
					oldIEFixes: null,
					importants: null,
					mediaQueries: null,
					oldPropertyPrefixes: null,
					qualifiedSelectors: null,
					specificityIdAvg: null,
					specificityIdTotal: null,
					specificityClassAvg: null,
					specificityClassTotal: null,
					specificityTagAvg: null,
					specificityTagTotal: null,
					selectorsByAttribute: null,
					selectorsByClass: null,
					selectorsById: null,
					selectorsByPseudo: null,
					selectorsByTag: null,
					universalSelectors: null,
					length: null,
					rules: null,
					declarations: null
				}
			}
		}, // analyzecss

		postcss: {
			options: {
				map: {
					inline: false, // saving sourcemaps as separate files
					annotation: 'site/dev/css/' // putting sourcemaps here
				},

				processors: [
					require('autoprefixer')({
						browsers: ['last 2 versions', '> 1%', 'iOS >= 6', 'Android > 3', 'ie > 8', 'Firefox ESR']
					})
				]
			},

			main: {
				src:  'site/dev/css/styles.css',
				dest: 'site/dev/css/css.css'
			},
			styleguide: {
				src:  'site/styleguide/css/styleguide.css',
				dest: 'site/styleguide/css/styleguide-neu.css'
			}
		} // postCSS

	}); // grunt.initConfig

	grunt.registerTask('default', ['watch:dev']);
	grunt.registerTask('sg-watch', ['watch:styleguide']);
	grunt.registerTask('dist', ['clean:dist', 'copy:dist', 'replace:dist']);
	grunt.registerTask('html', ['clean:html', 'php2html:dev', 'copy:html', 'validation'	]);
	grunt.registerTask('html-sg', ['clean:htmlstyleguide', 'sass:styleguide', 'php2html:styleguide','copy:htmlstyleguide']);

};

Diese Zeile gehört noch oben rein, bringt aber leider auch keine Veränderung:
// This one line spares us the call for each task at the end of the gruntfile. require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);