feat: new Web UI build system

- use generator-gulp-angular by @swiip
- remove old static file

webui/package.json

@@ -0,0 +1,55 @@
+{
+  "name": "traefik",
+  "version": "0.0.0",
+  "dependencies": {},
+  "scripts": {
+    "test": "gulp test"
+  },
+  "devDependencies": {
+    "estraverse": "~4.1.0",
+    "gulp": "~3.9.0",
+    "gulp-autoprefixer": "~3.0.2",
+    "gulp-angular-templatecache": "~1.8.0",
+    "del": "~2.0.2",
+    "lodash": "~3.10.1",
+    "gulp-minify-css": "~1.2.1",
+    "gulp-filter": "~3.0.1",
+    "gulp-flatten": "~0.2.0",
+    "gulp-eslint": "~1.0.0",
+    "eslint-plugin-angular": "~0.12.0",
+    "gulp-load-plugins": "~0.10.0",
+    "gulp-size": "~2.0.0",
+    "gulp-uglify": "~1.4.1",
+    "gulp-useref": "~1.3.0",
+    "gulp-util": "~3.0.6",
+    "gulp-ng-annotate": "~1.1.0",
+    "gulp-replace": "~0.5.4",
+    "gulp-rename": "~1.2.2",
+    "gulp-rev": "~6.0.1",
+    "gulp-rev-replace": "~0.4.2",
+    "gulp-minify-html": "~1.0.4",
+    "gulp-inject": "~3.0.0",
+    "gulp-protractor": "~1.0.0",
+    "gulp-sourcemaps": "~1.6.0",
+    "gulp-sass": "~2.0.4",
+    "gulp-angular-filesort": "~1.1.1",
+    "main-bower-files": "~2.9.0",
+    "wiredep": "~2.2.2",
+    "karma": "~0.13.10",
+    "karma-jasmine": "~0.3.6",
+    "karma-phantomjs-launcher": "~0.2.1",
+    "phantomjs": "~1.9.18",
+    "karma-angular-filesort": "~1.0.0",
+    "karma-coverage": "~0.5.2",
+    "karma-ng-html2js-preprocessor": "~0.2.0",
+    "browser-sync": "~2.9.11",
+    "browser-sync-spa": "~1.0.3",
+    "http-proxy-middleware": "~0.9.0",
+    "chalk": "~1.1.1",
+    "uglify-save-license": "~0.4.1",
+    "wrench": "~1.5.8"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  }
+}