Remove grunt

Per bee-queue#64 (comment)

Author: Eli Skeggs

.gitignore

@@ -18,9 +18,6 @@ coverage
 # nyc test coverage
 .nyc_output
 
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
 # node-waf configuration
 .lock-wscript
 

Gruntfile.js

@@ -11,18 +11,15 @@
     "ava": "^0.21.0",
     "ava-spec": "^1.1.0",
     "coveralls": "^2.11.2",
-    "grunt": "~0.4.5",
-    "grunt-cli": "^1.2.0",
-    "grunt-eslint": "^20.0.0",
-    "grunt-githooks": "^0.3.1",
+    "eslint": ">= 3",
     "lolex": "^2.0.0",
     "nyc": "^11.0.3",
     "sandboxed-module": "^2.0.3",
     "sinon": "^2.3.8"
   },
   "scripts": {
     "test": "npm run eslint && ava",
-    "eslint": "grunt eslint",
+    "eslint": "eslint lib/ test/",
     "coverage": "nyc ava",
     "report": "npm run coverage && nyc report --reporter=html",
     "coverage-and-publish": "npm run coverage && nyc report --reporter=text-lcov | coveralls",