gulp tasks and nunjucks templating

- reworked nearly all gulp tasks
- added html templating with nunjucks
- replaced some old html files
- started correction of scss and js files according to lint results

package.json

@@ -25,15 +25,24 @@
     "gulp-changed": "^3.1.0",
     "gulp-concat": "^2.6.1",
     "gulp-cssnano": "^2.1.2",
+    "gulp-if": "^2.0.2",
+    "gulp-jscs": "^4.0.0",
     "gulp-jshint": "^2.0.4",
+    "gulp-newer": "^1.3.0",
     "gulp-notify": "^3.0.0",
+    "gulp-nunjucks-render": "^2.2.1",
+    "gulp-plumber": "^1.1.0",
     "gulp-remember": "^0.3.1",
     "gulp-rename": "^1.2.2",
     "gulp-ruby-sass": "^2.1.1",
+    "gulp-sass": "^3.1.0",
     "gulp-sourcemaps": "^2.6.1",
     "gulp-uglify": "^3.0.0",
+    "gulp.spritesmith": "^6.5.1",
     "jshint": "^2.9.5",
+    "jshint-stylish": "^2.2.1",
     "pump": "^1.0.2",
+    "run-sequence": "^2.2.0",
     "uglify-es": "^3.1.2"
   },
   "dependencies": {}