fix gulpfile's linting errors and modify rules

.eslintrc

@@ -117,7 +117,7 @@
     "no-warning-comments": [0, {"terms": ["todo", "fixme"], "location": "start"}], // disallow usage of configurable warning terms in comments": 2, // e.g. TODO or FIXME (off by default)
     "no-with": 2, // disallow use of the with statement
     "radix": 2, // require use of the second argument for parseInt() (off by default)
-    "vars-on-top": 2, // requires to declare all vars on top of their containing scope (off by default)
+    "vars-on-top": 0, // requires to declare all vars on top of their containing scope (off by default)
     "wrap-iife": 2, // require immediate function invocation to be wrapped in parentheses (off by default)
     "yoda": 2, // require or disallow Yoda conditions
 
@@ -183,7 +183,7 @@
     "semi": [1, "always"], // require or disallow use of semicolons instead of ASI
     "semi-spacing": [1, {"before": false, "after": true}], // enforce spacing before and after semicolons
     "sort-vars": 0, // sort variables within the same declaration block (off by default)
-    "space-after-keywords": [1, "always"], // require a space after certain keywords (off by default)
+    "space-after-keywords": [0, "never"], // require a space after certain keywords (off by default)
     "space-before-blocks": [1, "always"], // require or disallow space before blocks (off by default)
     "space-before-function-paren": [1, {"anonymous": "never", "named": "never"}], // require or disallow space before function opening parenthesis (off by default)
     "space-in-brackets": [1, "never"], // require or disallow spaces inside brackets (off by default)

gulpfile.js

@@ -1,3 +1,4 @@
+/*eslint "no-var":0 */
 'use strict';
 
 var browserify = require('browserify');
@@ -15,6 +16,7 @@ var stylus = require('gulp-stylus');
 var uglify = require('gulp-uglify');
 var watchify = require('watchify');
 
+/*eslint "no-process-env":0 */
 var production = process.env.NODE_ENV === 'production';
 
 var config = {