Update dependencies, incl Bootstrap 4 alpha 3

package.json

@@ -41,24 +41,24 @@
     "clean-webpack-plugin": "^0.1.8",
     "css-loader": "^0.23.1",
     "cssnano": "^3.5.2",
-    "eslint": "^2.5.1",
-    "eslint-config-airbnb": "^6.2.0",
+    "eslint": "^3.2.2",
+    "eslint-config-airbnb": "^10.0.0",
     "eslint-loader": "^1.3.0",
-    "eslint-plugin-react": "^4.2.3",
+    "eslint-plugin-react": "^6.0.0",
     "extract-text-webpack-plugin": "^1.0.1",
-    "file-loader": "^0.8.5",
-    "image-webpack-loader": "^1.6.3",
-    "imagemin-pngcrush": "^4.1.0",
+    "file-loader": "^0.9.0",
+    "image-webpack-loader": "^2.0.0",
+    "imagemin-pngcrush": "^5.0.0",
     "imports-loader": "^0.6.5",
     "minimist": "^1.2.0",
     "monkey-hot-loader": "0.0.3",
     "node-sass": "^3.4.2",
     "optimize-css-assets-webpack-plugin": "^1.3.0",
     "postcss": "^5.0.18",
-    "postcss-loader": "^0.8.0",
+    "postcss-loader": "^0.9.1",
     "qs": "^6.1.0",
     "resolve-url-loader": "^1.4.3",
-    "sass-loader": "^3.1.1",
+    "sass-loader": "^4.0.0",
     "style-loader": "^0.13.0",
     "url-loader": "^0.5.7",
     "webpack": "^1.12.14",
@@ -67,7 +67,7 @@
   },
   "dependencies": {
     "babel-runtime": "^6.5.0",
-    "bootstrap": "^4.0.0-alpha.2",
+    "bootstrap": "^4.0.0-alpha.3",
     "jquery": "^2.1.4",
     "tether": "^1.2.0"
   }