Revert babel as the default parser.

This reverts commit df26467, reversing
changes made to 804d90f.

There are cases that cause the stack to blow up with Babel, apparently: eslint/eslint#3440

These issues seem to be fixed in eslint's master, but they're currently
in beta of a 2.0 release, so trying to merge in that with our changes
seems like a riskier change to make right now: we should wait until
they release 2.0 & take another look. For now, if you're using ES6, you
can opt into this config

bin/eslint.js

@@ -11,7 +11,7 @@ var CLIEngine = require("eslint").CLIEngine;
 var docs = require("eslint").docs;
 var fs = require("fs");
 var glob = require("glob");
-var options = { extensions: [".js"], parser: "babel-eslint", ignore: true, reset: false, useEslintrc: true};
+var options = { extensions: [".js"], ignore: true, reset: false, useEslintrc: true };
 var cli = new CLIEngine(options);
 var debug = false;
 var checks = require("../lib/checks");

package.json

@@ -8,11 +8,11 @@
     "url": "http://github.com/codeclimate/codeclimate-eslint.git"
   },
   "dependencies": {
-    "babel-eslint": "4.1.6",
+    "babel-eslint": "4.1.3",
     "eslint": "codeclimate/eslint.git#d24d0b",
     "eslint-config-airbnb": "^1.0.0",
-    "eslint-plugin-babel": "3.0.0",
-    "eslint-plugin-react": "3.15.0",
+    "eslint-plugin-babel": "2.1.1",
+    "eslint-plugin-react": "3.6.3",
     "glob": "5.0.14"
   },
   "devDependencies": {