Update dependencies (roots#1714)

browser-sync                         ^2.14.0  →  ^2.15.0
css-loader                           ^0.24.0  →  ^0.25.0
eslint-config-airbnb                 ^10.0.1  →  ^11.0.0
extract-text-webpack-plugin    ^2.0.0-beta.3  →  ^2.0.0-beta.4
imagemin-webpack-plugin               ^1.0.8  →   ^1.1.0
node-sass                             ^3.8.0  →   ^3.9.3
postcss                               ^5.1.2  →   ^5.2.0
postcss-loader                       ^0.11.0  →  ^0.13.0
sass-loader                           ^4.0.0  →   ^4.0.2
webpack                       ^2.1.0-beta.21  →   ^2.1.0-beta.22

package.json

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "assets-webpack-plugin": "^3.4.0",
-    "autoprefixer": "^6.4.0",
+    "autoprefixer": "^6.4.1",
     "babel-cli": "^6.14.0",
     "babel-core": "^6.14.0",
     "babel-eslint": "^6.1.2",
@@ -39,38 +39,38 @@
     "babel-register": "^6.14.0",
     "babel-runtime": "^6.11.6",
     "body-parser": "^1.15.2",
-    "browser-sync": "^2.14.0",
+    "browser-sync": "^2.15.0",
     "browser-sync-webpack-plugin": "^1.1.2",
     "clean-webpack-plugin": "^0.1.10",
-    "css-loader": "^0.24.0",
+    "css-loader": "^0.25.0",
     "cssnano": "^3.7.4",
     "eslint": "^3.4.0",
-    "eslint-config-airbnb": "^10.0.1",
+    "eslint-config-airbnb": "^11.0.0",
     "eslint-config-airbnb-es5": "^1.0.9",
     "eslint-loader": "^1.5.0",
     "eslint-plugin-import": "^1.14.0",
-    "eslint-plugin-jsx-a11y": "^2.2.0",
+    "eslint-plugin-jsx-a11y": "^2.2.1",
     "eslint-plugin-react": "^6.2.0",
-    "extract-text-webpack-plugin": "^2.0.0-beta.3",
+    "extract-text-webpack-plugin": "^2.0.0-beta.4",
     "file-loader": "^0.9.0",
     "glob-all": "^3.1.0",
     "imagemin-mozjpeg": "^6.0.0",
-    "imagemin-webpack-plugin": "^1.0.8",
+    "imagemin-webpack-plugin": "^1.1.0",
     "imports-loader": "^0.6.5",
     "lodash": "^4.15.0",
     "minimist": "^1.2.0",
     "monkey-hot-loader": "0.0.3",
-    "node-sass": "^3.8.0",
+    "node-sass": "^3.9.3",
     "optimize-css-assets-webpack-plugin": "^1.3.0",
-    "postcss": "^5.1.2",
-    "postcss-loader": "^0.11.0",
+    "postcss": "^5.2.0",
+    "postcss-loader": "^0.13.0",
     "qs": "^6.2.1",
     "resolve-url-loader": "^1.6.0",
     "rimraf": "^2.5.4",
-    "sass-loader": "^4.0.0",
+    "sass-loader": "^4.0.2",
     "style-loader": "^0.13.1",
     "url-loader": "^0.5.7",
-    "webpack": "^2.1.0-beta.21"
+    "webpack": "^2.1.0-beta.22"
   },
   "dependencies": {
     "bootstrap": "github:twbs/bootstrap#v4-dev",