Bump dependencies (facebook#3342)

* Bump dependencies

* Downgrade source-map back to 0.5.x

Not sure what changed there but our bundle snapshot doesn't match with minor changes.
I couldn't figure out how to update it, and also whether we need to tweak getPrettyURL in response.

package.json

@@ -21,41 +21,41 @@
     "react-scripts": "./bin/react-scripts.js"
   },
   "dependencies": {
-    "autoprefixer": "7.1.2",
-    "babel-core": "6.25.0",
+    "autoprefixer": "7.1.6",
+    "babel-core": "6.26.0",
     "babel-eslint": "7.2.3",
     "babel-jest": "20.0.3",
-    "babel-loader": "7.1.1",
+    "babel-loader": "7.1.2",
     "babel-preset-react-app": "^3.0.3",
     "babel-runtime": "6.26.0",
     "case-sensitive-paths-webpack-plugin": "2.1.1",
     "chalk": "1.1.3",
-    "css-loader": "0.28.4",
+    "css-loader": "0.28.7",
     "dotenv": "4.0.0",
-    "eslint": "4.4.1",
+    "eslint": "4.10.0",
     "eslint-config-react-app": "^2.0.1",
     "eslint-loader": "1.9.0",
-    "eslint-plugin-flowtype": "2.35.0",
-    "eslint-plugin-import": "2.7.0",
+    "eslint-plugin-flowtype": "2.39.1",
+    "eslint-plugin-import": "2.8.0",
     "eslint-plugin-jsx-a11y": "5.1.1",
     "eslint-plugin-react": "7.4.0",
-    "extract-text-webpack-plugin": "3.0.0",
-    "file-loader": "0.11.2",
+    "extract-text-webpack-plugin": "3.0.2",
+    "file-loader": "1.1.5",
     "fs-extra": "3.0.1",
     "html-webpack-plugin": "2.29.0",
     "jest": "20.0.4",
     "object-assign": "4.1.1",
     "postcss-flexbugs-fixes": "3.2.0",
-    "postcss-loader": "2.0.6",
+    "postcss-loader": "2.0.8",
     "promise": "8.0.1",
     "raf": "3.4.0",
     "react-dev-utils": "^4.1.0",
     "style-loader": "0.19.0",
     "sw-precache-webpack-plugin": "0.11.4",
     "url-loader": "0.6.2",
-    "webpack": "3.5.1",
-    "webpack-dev-server": "2.8.2",
-    "webpack-manifest-plugin": "1.2.1",
+    "webpack": "3.8.1",
+    "webpack-dev-server": "2.9.3",
+    "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"
   },
   "devDependencies": {