Use jshint-cli instead of grunt-jshint (#2064)

Gruntfile.coffee

@@ -3,13 +3,6 @@ module.exports = (grunt) ->
 
     grunt.initConfig
 
-        jshint:
-          c3: 'src/**/*.js'
-          spec: 'spec/**/*.js'
-          options:
-            reporter: require('jshint-stylish')
-            jshintrc: '.jshintrc'
-
         uglify:
           c3:
             files:
@@ -20,5 +13,4 @@ module.exports = (grunt) ->
             src: 'c3.css'
             dest: 'c3.min.css'
 
-    grunt.registerTask 'lint', ['jshint']
     grunt.registerTask 'minify', ['cssmin', 'uglify']

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "serve": "static -p 8080 htdocs/",
     "prepublish": "npm run dist",
-    "lint": "grunt lint",
+    "lint": "jshint --reporter=node_modules/jshint-stylish src/ spec/",
     "build": "npm run build:js && npm run build:css",
     "build:js": "rollup -f umd --name c3 --globals d3:d3 src/index.js > c3.js",
     "build:css": "node-sass src/scss/main.scss > c3.css",
@@ -36,9 +36,9 @@
     "grunt": "^0.4.5",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-cssmin": "^0.10.0",
-    "grunt-contrib-jshint": "^1.0.0",
     "grunt-contrib-uglify": "~0.4.0",
     "jasmine-core": "^2.3.4",
+    "jshint": "^2.9.4",
     "jshint-stylish": "^2.1.0",
     "karma": "^0.13.10",
     "karma-coverage": "^0.5.2",