use yarn lock package.json version

package.json

@@ -10,7 +10,7 @@
     "packages"
   ],
   "scripts": {
-    "bootstrap": "npm i --registry=http://registry.npm.qima-inc.com",
+    "bootstrap": "yarn || npm i --registry=http://registry.npm.qima-inc.com",
     "dev": "npm run build:file && webpack-dev-server --inline --history-api-fallback --hot --config build/webpack.config.js",
     "build:file": "node build/bin/build-entry.js",
     "build:utils": "cross-env BABEL_ENV=utils babel src --out-dir lib --ignore src/index.js",
@@ -77,10 +77,7 @@
     "extract-text-webpack-plugin": "^2.0.0-beta.5",
     "file-loader": "^0.9.0",
     "file-save": "^0.2.0",
-    "gh-pages": "^0.11.0",
     "gulp": "^3.9.1",
-    "gulp-cssmin": "^0.1.7",
-    "gulp-postcss": "^6.1.1",
     "gulp-util": "^3.0.8",
     "highlight.js": "^9.8.0",
     "html-loader": "^0.4.3",