bump grunt-eslint to ^6.0.0

.eslintrc

@@ -12,13 +12,16 @@
         "curly": 2,
         "eol-last": 2,
         "eqeqeq": 2,
+        "indent": [2, 2],
         "key-spacing": [2, {"beforeColon": false, "afterColon": true}],
         "new-cap": 2,
         "new-parens": 2,
         "no-array-constructor": 2,
         "no-bitwise": 2,
         "no-constant-condition": 0,
+        "no-eval": 2,
         "no-floating-decimal": 2,
+        "no-implied-eval": 2,
         "no-inline-comments": 0,
         "no-irregular-whitespace": 2,
         "no-mixed-spaces-and-tabs": 2,

package.json

@@ -27,7 +27,7 @@
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-jshint": "^0.11.0",
     "grunt-contrib-nodeunit": "^0.4.1",
-    "grunt-eslint": "^5.1.0",
+    "grunt-eslint": "^6.0.0",
     "grunt-jscs": "^1.5.0",
     "load-grunt-tasks": "^3.1.0"
   },