Downgrade eslint to get linting to pass

Upgrade to ^0.21.2 after release fixes eslint/eslint#2545

Author: Jimmy Jia

package.json

@@ -45,7 +45,7 @@
     "colors": "^1.0.3",
     "css-loader": "^0.12.0",
     "es5-shim": "^4.1.0",
-    "eslint": "^0.21.0",
+    "eslint": "0.21.0",
     "eslint-plugin-react": "^2.1.0",
     "express": "^4.12.3",
     "extract-text-webpack-plugin": "^0.8.0",
@@ -86,4 +86,4 @@
   "dependencies": {
     "classnames": "^2.0.0"
   }
-}
+}